vrrp: fix non-existent vmac base interface at reload #2281
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When an existing use_vmac VRRP instance is updated with a non-existent base interface, the instance goes to FAULT. However, when the base interface is created, the VMAC interface is not updated and the instance remains in FAULT state.
Delete the VMAC interface if the base interface is changed to a non-existent one. The VMAC interface will be re-created when the base interface appears.