Logical interface may not have link to VMI
Logical interface may not have link to VMI

Allow for logical interface to not have any VMI refs

Change-Id: Icee6e1e3d1d31b9a43dfcffe77436c83897115c8
Closes-Bug: 1735589

eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller