Tags

Features:
- Add option for custom registries / mirrors

Fixes:
- Expand secure_path with support for Suse

Fixes:
- Adding sysctl tags.
- Updating dependencies.

Fixes: 
- ERROR! The requested handler <'Reboot containers' / 'Reboot server' / 'Reboot>' was not found in either the main handlers list nor in the listening handlers list
- Updating Ansible dependencies

Some fixes and removing old files

For improved flexibility and maintainability.

* Update tasks in node role to use 'group_name_master' variable instead
  of hardcoded 'master' group name
* Update tasks in master role to use 'group_name_master' variable instead
  of hardcoded 'master' group name
* Update tasks in post role to use 'group_name_master' variable instead of
  hardcoded 'master' group name