Replace mox with mocks in tests.compute.pollsters

Change-Id: Iea844b86e64e7bf4a231406cd7532dd5c28002dc
Merge "Replace mox with mocks in tests.compute.pollsters"
inital minimalist impl ... skeleton

We no need rpc service here,
so use simple openstack.service in place
http publisher

change namespace s/vm/metric ..