cobbler: fix bug with lacp_rate wich is useless in balance-xor mode
cobbler: fix bug with lacp_rate wich is useless in balance-xor mode

Change-Id: Ib60c3d5b8aa15131bb7b851f9adf0cf04dea0b69

CiscoSystems/os-sqe,CiscoSystems/os-sqe,CiscoSystems/os-sqe