Remove _ceilometer_check_for_storage check

We can check from the history[0], actually it doesn't matter if
gnocchi or panko is started first., so this check is unnecessary.
Also when i want to migration using native zuulv3, the enabled
plugins is in the alphabetical order, so this will caused can not
install devstack correctly.

[0]: https://review.opendev.org/#/c/387620
[1]: http://logs.openstack.org/99/651999/3/check/telemetry-integration-test/9066108/controller/logs/devstacklog.txt.gz#_2019-04-17_07_26_30_988
Change-Id: I5cbd93739f75b8141f8b79ae03bb8b99756b2a38

devstack/settings

@@ -55,24 +55,6 @@ CEILOMETER_EVENT_ALARM=${CEILOMETER_EVENT_ALARM:-False}
 # Set up default directories for middleware
 GITDIR["ceilometermiddleware"]=$DEST/ceilometermiddleware
 
-# Make sure panko plugin is enabled before ceilometer
-function _ceilometer_check_for_storage  {
-    local plugins="${DEVSTACK_PLUGINS}"
-    local plugin
-
-    local seen_ceilometer=False
-
-    for plugin in ${plugins//,/ }; do
-        if [ "$plugin" == 'ceilometer' ]; then
-             seen_ceilometer=True
-        elif [ "$plugin" == 'panko' ] && [[ "$seen_ceilometer" == 'True' ]]; then
-             die $LINENO "Panko must be enabled before ceilometer!"
-        fi
-    done
-}
-
-_ceilometer_check_for_storage
-
 # Get rid of this before done.
 # Tell emacs to use shell-script-mode
 ## Local variables: