[libvirt] Do not fail migration if the media is ejected inside guest.
The whole mail title should be "Do not fail migration if the media is
ejected inside guest and the media source is removed".
Following 2 patches are trying to solve it, please see the patch
descriptions for more detail.
BZ# https://bugzilla.redhat.com/show_bug.cgi?id=725673
[PATCH 1/2] qemu: Get the media status of removable block device
[PATCH 2/2] qemu: Clear source path of removable block if it is
Osier