Remove unused oslo-incubator modules

rootwrap and config/generator are more server oriented modules
and for sure unused in a client.

Change-Id: Idc46352fa26a6f4b87ef2ad97d2bd86758c1a0eb
Rename nodes/<uuid>/state to nodes/<uuid>/states

The commit https://review.openstack.org/#/c/60299 refactored the /state
subresource of nodes in the Ironic API and one of the changes made was
to rename the subresource from /state to /states (plural) since now both
power and provision state can be retrieved in one request call.

Change-Id: I3e3cf29fa0fd48063ae0ca14eac6f685ccc44e65
Merge "Remove unused oslo-incubator modules"