Make sure that keystonemiddleware package is installed

With I58dad8e1151067bf8df37e511fff5fc0e3dfb487 we switched from
obsolete keystoneclient to keystonemiddleware, make sure that proper
package is installed too.

Change-Id: Ifee489dbb52d4ae401d010d34ca5e244ea3e08e3
Merge "Make sure that keystonemiddleware package is installed"