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

Change-Id: I926f57fe74e17ce17c2dc3e0b62b46577cfcba30

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