PostgreSQL v13 installation

[atsikham]

Installation (apply) part of task #1861 for PostgreSQL, PgAudit, PgPool, Repmgr (except PgBouncer).
PgBouncer will be probably handled in the scope of #2076

• Some thoughts from this comment were taken into account.
• Added Molecule Ansible tests.

[atsikham]

Default postgresql.conf difference:

Debian

data_directory = '/var/lib/postgresql/13/main'          # use data in another directory
                                        # (change requires restart)
hba_file = '/etc/postgresql/13/main/pg_hba.conf'        # host-based authentication file
                                        # (change requires restart)
ident_file = '/etc/postgresql/13/main/pg_ident.conf'    # ident configuration file
                                        # (change requires restart)
# If external_pid_file is not explicitly set, no extra PID file is written.
external_pid_file = '/var/run/postgresql/13-main.pid'                   # write an extra PID file
                                        # (change requires restart)
port = 5432                             # (change requires restart)
unix_socket_directories = '/var/run/postgresql' # comma-separated list of directories
#password_encryption = md5              # md5 or scram-sha-256
ssl = on
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'
#log_destination = 'stderr'             # Valid values are combinations of
                                        # stderr, csvlog, syslog, and eventlog,
                                        # depending on platform.  csvlog
                                        # requires logging_collector to be on.
# This is used when logging to stderr:
#logging_collector = off                # Enable capturing of stderr and csvlog
                                        # into log files. Required to be on for
                                        # csvlogs.
                                        # (change requires restart)
# These are only used if logging_collector is on:
#log_directory = 'log'                  # directory where log files are written,
                                        # can be absolute or relative to PGDATA
#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'        # log file name pattern,
                                        # can include strftime() escapes
#log_truncate_on_rotation = off         # If on, an existing log file with the
                                        # same name as the new log file will be
                                        # truncated rather than appended to.
                                        # But such truncation only occurs on
                                        # time-driven rotation, not on restarts
                                        # or size-driven rotation.  Default is
                                        # off, meaning append to existing files
                                        # in all cases.
#log_rotation_age = 1d                  # Automatic rotation of logfiles will
                                        # happen after that time.  0 disables.
#log_rotation_size = 10MB               # Automatic rotation of logfiles will
                                        # happen after that much log output.
                                        # 0 disables.
log_line_prefix = '%m [%p] %q%u@%d '            # special values:
log_timezone = 'Etc/UTC'
cluster_name = '13/main'                        # added to process titles if nonempty
stats_temp_directory = '/var/run/postgresql/13-main.pg_stat_tmp'
timezone = 'Etc/UTC'
lc_messages = 'C.UTF-8'                 # locale for system error message
lc_monetary = 'C.UTF-8'                 # locale for monetary formatting
lc_numeric = 'C.UTF-8'                  # locale for number formatting
lc_time = 'C.UTF-8'                             # locale for time formatting
#extension_destdir = ''                 # prepend path when loading extensions
                                        # and shared objects (added by Debian)
include_dir = 'conf.d'                  # include files ending in '.conf' from

RedHat

#data_directory = 'ConfigDir'           # use data in another directory
                                        # (change requires restart)
#hba_file = 'ConfigDir/pg_hba.conf'     # host-based authentication file
                                        # (change requires restart)
#ident_file = 'ConfigDir/pg_ident.conf' # ident configuration file
                                        # (change requires restart)

# If external_pid_file is not explicitly set, no extra PID file is written.
#external_pid_file = ''                 # write an extra PID file
                                        # (change requires restart)
#port = 5432                            # (change requires restart)
#unix_socket_directories = '/var/run/postgresql, /tmp'  # comma-separated list of directories
password_encryption = scram-sha-256             # md5 or scram-sha-256
#ssl = off
#ssl_cert_file = 'server.crt'
#ssl_key_file = 'server.key'
log_destination = 'stderr'              # Valid values are combinations of
                                        # stderr, csvlog, syslog, and eventlog,
                                        # depending on platform.  csvlog
                                        # requires logging_collector to be on.
# This is used when logging to stderr:
logging_collector = on                  # Enable capturing of stderr and csvlog
                                        # into log files. Required to be on for
                                        # csvlogs.
                                        # (change requires restart)
# These are only used if logging_collector is on:
log_directory = 'log'                   # directory where log files are written,
                                        # can be absolute or relative to PGDATA
log_filename = 'postgresql-%a.log'      # log file name pattern,
                                        # can include strftime() escapes
log_truncate_on_rotation = on           # If on, an existing log file with the
                                        # same name as the new log file will be
                                        # truncated rather than appended to.
                                        # But such truncation only occurs on
                                        # time-driven rotation, not on restarts
                                        # or size-driven rotation.  Default is
                                        # off, meaning append to existing files
                                        # in all cases.
log_rotation_age = 1d                   # Automatic rotation of logfiles will
                                        # happen after that time.  0 disables.
log_rotation_size = 0                   # Automatic rotation of logfiles will
                                        # happen after that much log output.
                                        # 0 disables.
log_line_prefix = '%m [%p] '            # special values:
log_timezone = 'UTC'
#cluster_name = ''                      # added to process titles if nonempty
#stats_temp_directory = 'pg_stat_tmp'
timezone = 'UTC'
lc_messages = 'en_US.UTF-8'                     # locale for system error message
lc_monetary = 'en_US.UTF-8'                     # locale for monetary formatting
lc_numeric = 'en_US.UTF-8'                      # locale for number formatting
lc_time = 'en_US.UTF-8'                         # locale for time formatting

#include_dir = '...'                    # include files ending in '.conf' from