Remove check_uptodate.sh check from tox.ini

This removes the check_uptodate.sh test from the py2* tox envs and
run_tests.sh. It also syncs the sample config one last time to document
some new options available to users running with the newer
oslo.messaging versions.

Conflicts:
	etc/cinder/cinder.conf.sample
	tox.ini

Change-Id: I6107b996d5da808c3222696a9549ee06c22f80b9
Closes-bug: #1399085
(cherry picked from commit 31b58310ddf519c241191919be8ffcbdaf0e4983)