Fix devstack runprocess for cloudkitty api

After the commit
openstack/pbr@8778c64

The module PBR in openstack started to validating the parameters when
creating an embedded WSGI, now if invalid arguments are given
to the cloudkitty-api it raises an error as we are facing in the
devstack when using `CLOUDKITTY_USE_MOD_WSGI=False`:

cloudkitty-api[86126]: usage: cloudkitty-api [-h] [--port PORT] [--host IP] -- [passed options]
cloudkitty-api[86126]: cloudkitty-api: error: unrecognized arguments: --config-file=/etc/cloudkitty/cloudkitty.conf

This PR also extracts the upgrade database workflow to a function
to be used in grenade tests

Change-Id: Ifc1a8563a9efcae2abaa6f8eb036405a93ff296d
(cherry picked from commit 25a7306)

Author: pedro-martins

devstack/plugin.sh

@@ -279,7 +279,7 @@ function init_cloudkitty {
     create_opensearch_index
 
     # Migrate cloudkitty database
-    $CLOUDKITTY_BIN_DIR/cloudkitty-dbsync upgrade
+    upgrade_cloudkitty_database
 
     # Init the storage backend
     if [ $CLOUDKITTY_STORAGE_BACKEND == 'hybrid' ]; then
@@ -381,7 +381,7 @@ function install_cloudkitty {
 function start_cloudkitty {
     run_process ck-proc "$CLOUDKITTY_BIN_DIR/cloudkitty-processor --config-file=$CLOUDKITTY_CONF"
     if [[ "$CLOUDKITTY_USE_MOD_WSGI" == "False" ]]; then
-        run_process ck-api "$CLOUDKITTY_BIN_DIR/cloudkitty-api --config-file=$CLOUDKITTY_CONF"
+        run_process ck-api "$CLOUDKITTY_BIN_DIR/cloudkitty-api --host $CLOUDKITTY_SERVICE_HOST --port $CLOUDKITTY_SERVICE_PORT"
     elif is_service_enabled ck-api; then
         enable_apache_site cloudkitty
         echo_summary "Waiting 15s for cloudkitty-processor to authenticate against keystone before apache is restarted."
@@ -443,6 +443,11 @@ function update_horizon_static {
     restart_apache_server
 }
 
+# Upgrade cloudkitty database
+function upgrade_cloudkitty_database {
+    $CLOUDKITTY_BIN_DIR/cloudkitty-dbsync upgrade
+}
+
 # configure_cloudkitty_dashboard() - Set config files, create data dirs, etc
 function configure_cloudkitty_dashboard {
     sudo ln -s  $CLOUDKITTY_ENABLED_DIR/_[0-9]*.py \