Add client='unittest' supporting in remote_login.

Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>
Minor fix for supporting remote unittest.

Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>
Add some unittest for remote libvirtd.

Signed-off-by: yangdongsheng <yangds.fnst@cn.fujitsu.com>