Remove Fedora/libvirt workaround

An updated libvirt package to address [1] is in Fedora 20 now, so we
don't need this work-around.  Modify the comments of the other part of
the work-around (restart of services) and link to the most relevant
bug

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1098376

Change-Id: I47fba7b4f273162c2af1e37902a512041449750b
Merge "Remove Fedora/libvirt workaround"