HyperV was added during Folsom

Updated the HyperV driver to have the correct list of releases. While
present earlier, the current driver was added during folsom:
https://wiki.openstack.org/wiki/ReleaseNotes/Folsom#Key_New_Features_2

Change-Id: I7a4a9a556621b01d6b67c41fabe286f37bbe9766
Merge "HyperV was added during Folsom"