Update plugin option label
Update plugin option label

Change-Id: I74b62e0cce9d1101340572c11baab5abad2e208e
Signed-off-by: Guo Ruijing <941cd458652bd2387d6420a5e549d9433c53f366@intel.com>

georgepar/fuel-plugin-ovs-mirror,georgepar/fuel-plugin-ovs-mirror,georgepar/fuel-plugin-ovs-mirror