Rename cinder-rtstool to rtstool

Since rtstool is being distributed externally, it will be named
rtstool rather than cinder-rtstool.

Change-Id: Ieff072ab8315928ed02837aff63c08601b1d2acd
Use OpenStack common project requires.

This patch is an update of pip-requires and test-requires
using the openstack/requirements script.

One exception was made to pep8, which is being fixed in the
upstream script.

Change-Id: I4bd61e0ec6f1995f9f36a724eb8dbe15345caca0
Merge "Use OpenStack common project requires."
Merge "Rename cinder-rtstool to rtstool"