MT#57270 Use localhost as NGCP_HOSTNAME for CE

The variable NGCP_HOSTNAME is not defined in /etc/default/ngcp-roles
file so fallback to 'localhost'. The value 'spce' can't be used as there
is no grant for this hostname in mariadb.

Change-Id: I7ee48d00c7615678574bce8194ab29e07774de96

sbin/ngcp-mysql-compare-dbs

@@ -19,7 +19,7 @@ __USAGE__
 }
 
 get_local_instances() {
-  local_instances+=("${NGCP_HOSTNAME}:3306")
+  local_instances+=("${NGCP_HOSTNAME:-localhost}:3306")
   if [[ "${NGCP_TYPE}" == 'carrier' && "${NGCP_IS_PROXY}" == 'yes' ]]; then
     local_instances+=("${NGCP_HOSTNAME}:3308")
   fi