[OOF] Use the common mariadb-galera instance

[OOF] Use the common mariadb-galera instance

Updates for OOF CMSO:
- Add section under (.Values.global) for shared mariadb instance with a
condition to instantiate local instance.
- Use a hook to send mariadb info to oof-csmo-service and
oof-csmo-optimizer
- Add condition under (requirments.yaml) to install local mariadb
instance
- Update oof-cmso-service and oof-cmso-optimizer (.Values) files to
accomodate for local mariadb instance
- Update oof-cmso-service and oof-cmso-optimizer deployments to use the
templates defined under (templates/_mariadb.tpl)

Issue-ID: OOM-2769
Signed-off-by: Mahmoud Abdelhamid <mahmoud.abdelhamid@orange.com>
Change-Id: I59e6c98ae992faafd363c5f97e18bf631f9c4d4e