Option "notify_on_state_change" from group "DEFAULT" is deprecated. Use
option "notify_on_state_change" from group “notifications".

refer to
https://docs.openstack.org/ocata/config-reference/compute/config-options.html

Change-Id: I18e80ccd5981b81bfd597b94717ed77b13c05222
Closes-Bug: #1690494