Add ex vols to protected sg

[SerDroide]

Description

Capability to add a volume, that belongs to a storage group protected with srdf, also to another storage group

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
#51

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, pep8, linting, or security issues
• [] I have performed Ansible Sanity test using --docker default
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Backward compatibility is not broken

How Has This Been Tested?

I'm working on a collection that leverage this one and I have molecule tests that do add and remove volumes from storage groups

• Add existing and protect volume to a second storage group