Fix libvirt_pool_exists recognition on openSUSE 13.2

It seems that the output of virsh under 13.2 has changed a little bit
so the regex was adapted accordingly.
Incorporate package change from kvm to qemu-kvm in setup
Merge pull request #22 from SUSE/fix_libvirt_pool_exists_on_13_2

Fix libvirt_pool_exists recognition on openSUSE 13.2