run: add libvirt specific options install and remove

Running the libvirt tests requires configured guest in libvirt.
This introduce new options, the first one is '--install' which
will install the guest using import method.

There is also second new option '--remove' which will remove the
guest from libvirt without deleting the disk file.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>