remove cinder-rtstool because of rtslib dep

rtslib is AGPL, so cinder-rtstool is defacto AGPL by importing it.
Remove cinder-rtstool from the OpenStack repository.

Fixes bug #1157091

Change-Id: I30c9ee19d43107fa7f2e5e65d69049b8d69d2bdf
(cherry picked from commit b66c3361be2095186e19b0d44e49a8b2c48f7235)