[Tooling update] health_checks

* Added:
- get_cinder_db_versions: Retrieve cinder db release codename
- get_glance_db_versions: Retrieve glance db release codename
- get_heat_db_versions: Retrieve heat db release codename
- get_neutron_db_versions: Retrieve neutron db release codename
- get_keystone_db_versions: Retrieve keystone db release codename
- get_nova_db_versions: Retrieve nova db release codename
- list_db_versions: Retrieve openstack DB release codenames

* Extra:
- fixed kitchen test (metadata import)
- fixed salt grain import: https://github.com/saltstack/salt/pull/56094
- Schema validator is not enabled. Should be added in next patch.

Change-Id: Iad318511ec6ee3d0c98c503cf66fdcf3ad146427
Prod-Related: PROD-34978
6 files changed