virt: Makes suspending more verbose.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
virt: Repairs rewriting guests params.

solve problem with some tests.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
virt: guest_suspend test take first vm not only main_vm.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
virt: Repairs suspend detect message.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
virt: Adds suspend multi-host tests.

This patch slightly changes structure of basic multihost test
and adds possibility for start sub_test after main migration test.

Signed-off-by: Jiří Župka <jzupka@redhat.com>