[COMMON/VID] Modified VID to use Shared DB.

[COMMON/VID] Modified VID to use Shared DB.

This change modifies VID to use the shared DB instance of mariadb.
In addition, we create a mechanism in mariadb-init to allow a shared DB
user to run a script after the DB has been created.
The script can be passed as a configMap (as is the case with VID) or it
can be a standalone script that is passed as a string.

Issue-ID: OOM-1226
Change-Id: Ie51823338562a6fbe7472025d62cd4dba688168d
Signed-off-by: RPMishra <rpmishra@aarnanetworks.com>
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>