When using the BlockStorage role there is one cinder volume per node and
those are not managed by pcmk. So when we force the property for all
nodes that have cinder_volume we will fail because pcmk is not running
on those nodes. Let's not set properties for nodes that are not running
pacemaker.
While we're at it let's remove *_nodes_count which are not used anyway.
Closes-Bug: #1786412
Change-Id: I42e9f3244bad60b5df2dfa940f132f72c606620e