ceilometer: do not fail when using an unsupported database type

This is necessary if e.g. Prometheus is used. Then the
ceilometer-upgrade is not needed.

Signed-off-by: Christian Berendt <berendt@betacloud-solutions.de>
Change-Id: I8690e5543e6b5f37f41fe35f659910fc869c034f
(cherry picked from commit ea8592b077)

docker/ceilometer/ceilometer-notification/extend_start.sh

@@ -5,9 +5,6 @@
 if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
     if [[ "${CEILOMETER_DATABASE_TYPE}" == "gnocchi" ]]; then
         ceilometer-upgrade ${CEILOMETER_UPGRADE_PARAMS}
-    else
-        echo "Unsupported database type: ${CEILOMETER_DATABASE_TYPE}"
-        exit 1
     fi
     sudo chown -R ceilometer: /var/lib/ceilometer/
     exit 0