Revert "remove cinder-rtstool because of rtslib dep"

This reverts commit b66c3361be2095186e19b0d44e49a8b2c48f7235.

Dependencies of this code (rtslib-fb) are now Apache-licensed,
which resolves the previous issue with this code being in-tree.

This patch is a direct revert, other patches will follow to
line up changes that have occurred between b66c336 and now.

Conflicts:
	setup.py

Blueprint: lio-rtslib

Change-Id: I14786bddf419d98ff7c468b185462f5387dbbba1
Merge "Revert "remove cinder-rtstool because of rtslib dep""