[cli-ref] Update python-watcherclient to 0.27.0
[cli-ref] Update python-watcherclient to 0.27.0

Change-Id: I5b3a40dc051dc5d4451cb54ec184bb80f847a8b5

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals