Tests should not create files in protected directories

[bfahr]

PR #3396 added tests that attempt to create files in the path /var/cache/insights-client. These tests should either be skipped by default or changed to use mock instead. @ahitacat would you mind to please take a look at this?

ERROR:insights.client.archive:ERROR: Could not create /var/cache/insights-client
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/user/work/merges/insights-core/insights/client/archive.py", line 261, in storing_archive
    os.makedirs(self.keep_archive_dir)
  File "/usr/lib64/python3.8/os.py", line 223, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/var/cache/insights-client'
ERROR:insights.client.archive:ERROR: Could not create /var/cache/insights-client
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/user/work/merges/insights-core/insights/client/archive.py", line 261, in storing_archive
    os.makedirs(self.keep_archive_dir)
  File "/usr/lib64/python3.8/os.py", line 223, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/var/cache/insights-client'
ERROR:insights.client.archive:ERROR: Could not create /var/cache/insights-client
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/user/work/merges/insights-core/insights/client/archive.py", line 261, in storing_archive
    os.makedirs(self.keep_archive_dir)
  File "/usr/lib64/python3.8/os.py", line 223, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/var/cache/insights-client'
ERROR:insights.client.archive:ERROR: Could not create /var/cache/insights-client
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/user/work/merges/insights-core/insights/client/archive.py", line 261, in storing_archive
    os.makedirs(self.keep_archive_dir)
  File "/usr/lib64/python3.8/os.py", line 223, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/var/cache/insights-client'
ERROR:insights.client.archive:ERROR: Could not create /var/cache/insights-client
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/user/work/merges/insights-core/insights/client/archive.py", line 261, in storing_archive
    os.makedirs(self.keep_archive_dir)
  File "/usr/lib64/python3.8/os.py", line 223, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/var/cache/insights-client'
ERROR:insights.client.archive:ERROR: Could not create /var/cache/insights-client
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/home/user/work/merges/insights-core/insights/client/archive.py", line 261, in storing_archive
    os.makedirs(self.keep_archive_dir)
  File "/usr/lib64/python3.8/os.py", line 223, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/var/cache/insights-client'