v3.4.0: Adding Restore Functionality (#10)

* Initial re-drafting variables to support backup configuration for gitlab v12.1+, parameterizing the backup schedule to allow for greater flexibility

* Temporarily disabling the installation of cron to debug values

* Resolving template issues for gitlab configuration backups

* Adding customizable environment variable configuration for GitLab Application Backup Cron tasks

* Fixing up templating for ansible-role

* Cleaning up the filtering process for gitlab_config_backup_env_vars

* Correcting backup command debugging message

* Adding backup:restore commands for debugging

* Finalizing tasks/restore.yml and including gitlab_config_privilege_escalation_user to parameterize become_user for ansible-role

* Cleaning up vars/main.tf

* Removing debugging message block

* Adding dependent roles and debugging andrewrothstein.gitlab vars

* Dropping gitlab_ver definition

* Cleaning up main/task.yml

* Parameterize the letsencrypt operation for omnibus-gitlab in test domain on vSphere-Lab

* Convert ansible_bool variable to JSON compatible value