Fix ceilometer-upgrade params

It seems [1] has introduced a slight regression in that it tries
by default to pass an empty string to ceilometer-upgrade which
makes it fail:

ceilometer-upgrade: error: unrecognized arguments:

(note there is nothing more on that line)

This patch fixes that by allowing the params to be of any number,
including zero.

Backport to Ussuri.

[1] 3d587409ee

Change-Id: I989a1dd30d1656b5c1fda7a46abbf5f265fbb72c
Closes-Bug: #1884919

docker/ceilometer/ceilometer-notification/extend_start.sh

@@ -4,7 +4,7 @@
 # of the KOLLA_BOOTSTRAP variable being set, including empty.
 if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
     if [[ "${CEILOMETER_DATABASE_TYPE}" == "gnocchi" ]]; then
-        ceilometer-upgrade "${CEILOMETER_UPGRADE_PARAMS}"
+        ceilometer-upgrade ${CEILOMETER_UPGRADE_PARAMS}
     else
         echo "Unsupported database type: ${CEILOMETER_DATABASE_TYPE}"
         exit 1

releasenotes/notes/bug-1884919-6be7e60872c5eb86.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes Ceilometer deployment and upgrade failing due to wrong mode of
+    argument passing applied to the ``ceilometer-upgrade`` command.
+    `LP#1884919 <https://launchpad.net/bugs/1884919>`__