FVT of vnic: couple/uncouple/delete, guest_get_nic_vswitch_info
FVT of vnic: couple/uncouple/delete, guest_get_nic_vswitch_info

Change-Id: I24246991eb2db8050653b3d08dbb068d4aa8e72c

mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk,mfcloud/python-zvm-sdk