CA-178651 FCoE NIC is not prevented from unplugging
CA-178651 FCoE NIC is not prevented from unplugging

Add api errors

Signed-off-by: Yang Qian <878b6bb28d04daaf954782c6a6b5805aa09fd09b@citrix.com>

MihaelaStoica/xenadmin,minli1/xenadmin,stephen-turner/xenadmin,kc284/xenadmin,kc284/xenadmin,xenserver/xenadmin,stephen-turner/xenadmin,stephen-turner/xenadmin,minli1/xenadmin,stephen-turner/xenadmin,xenserver/xenadmin,minli1/xenadmin,MihaelaStoica/xenadmin,kc284/xenadmin,minli1/xenadmin,xenserver/xenadmin,minli1/xenadmin,MihaelaStoica/xenadmin,kc284/xenadmin,stephen-turner/xenadmin,MihaelaStoica/xenadmin,MihaelaStoica/xenadmin,kc284/xenadmin,MihaelaStoica/xenadmin,stephen-turner/xenadmin,minli1/xenadmin