TT#26264 Use service(8) instead of directly calling /etc/init.d/<service>

We are in the process of removing the obsolete init scripts, so trying
to use them directly will make these operations not work at all.

Change-Id: Ifff400388a947294ca661b3b8bad793b755ee830

ngcp-update-db-schema

@@ -38,7 +38,7 @@ if [ "${nodename}" = "unknown" ] ; then
   exit 1
 fi
 
-/etc/init.d/mysql start || true
+service mysql start || true
 . /etc/mysql/sipwise.cnf
 
 . /etc/default/ngcp-roles