Update python-tempestconf to 2.3.0 in Queens
Update python-tempestconf to 2.3.0 in Queens

The review updates the tag for python-tempestconf to
2.3.0 version in Queens.

Change-Id: Ibf7ca31968e67d111242a3bb1111ef55c706238d

redhat-openstack/rdoinfo,javierpena/rdoinfo