Update to latest openstack.common.setup.

We actually don't need the silly versioninfo file at all anymore.

Change-Id: Ic759c39a29b07d41a96849db84a7f9990ec8a3eb
Ensure shell tests use isolated env variables set

Fixes bug 1161008.

Change-Id: Id9d76f39c898d4cff65aefa636e9dd2f092d42bd
Merge "Update to latest openstack.common.setup."
Merge "Ensure shell tests use isolated env variables set"