Remove haproxy galera monitoring user
Remove haproxy galera monitoring user

Prior to kilo, we created a static 'haproxy' MySQL user for haproxy.
In kilo and onwards, we now have a user variable called
galera_monitoring_user which defaults to monitoring.  This commit
updates scripts/run-upgrade.sh to remove the old haproxy user to
ensure we don't have a defunct MySQL user lying about.

Change-Id: I071596c4c6d881d5304fc49a7cf752d5489ee19b
Closes-Bug: #1472673
(cherry picked from commit c51aaaccac3fca5cc202c7784ecb9f7a9490d5d0)

yanyao/openstack-deployment,VaneCloud/openstack-ansible,yanyao/openstack-deployment,yanyao/openstack-deployment,VaneCloud/openstack-ansible,yanyao/openstack-deployment,VaneCloud/openstack-ansible