Add devstack-f20 to hpcloud

Add devstack-f20 to hpcloud using the 'Fedora 20 Server 64-bit
20140407 - Partner Image'.  I have run the devstack preparation
scripts manually and found no problems.

Change-Id: I562c558409ebc630a5d7b26774fe4132d7bd6b61
Merge "Add devstack-f20 to hpcloud"