Make virt-who work again

The virt-who developers changed the structure of the package a bit
and we need to tweak a bit to account. Also, futureproof EL7 a
little since this change will probably land there as well.

Change-Id: I6955630310ed9b6f23336c21014ebcafce88f0f2
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1152414
Signed-off-by: Ryan Barry <rbarry@redhat.com>