Add test case for colon in value

Adds a test case for a colon in a value

Change-Id: Ica56b8af5fa59a008cfe96424b1d3e17fd6cf7d6
Merge commit 'refs/changes/03/127603/2' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch