mariadb: call os-svc-enable

When configuring Mariadb we should always auto-start the
Mariadb (or mysql) daemon on startup. This prevents breaking simple
use cases like rebooting nodes, etc.

This patch updates the mariadb-rpm element to autostart mariadb.

The mariadb element is also updated to autostart 'mysql' (which
is the service name that element uses instead).

Change-Id: I02ccead89ce5054557a7037cbf127cbe6e75425b

elements/mariadb-rpm/os-refresh-config/configure.d/52-mariadb-rpm-init

@@ -33,3 +33,5 @@ if [ ! -e ${MYSQL_INITIALIZED} ]; then
     # We did db initialization by hand so reset-db doesnt need to interfere
     touch ${MYSQL_INITIALIZED}
 fi
+
+os-svc-enable -n mariadb

elements/mariadb/os-refresh-config/configure.d/52-mariadb-init

@@ -18,3 +18,5 @@ if [ ! -e ${MYSQL_INITIALIZED} ]; then
         exit 1
     fi
 fi
+
+os-svc-enable -n mysql