cluster: don't set external-ids in master codepaths
cluster: don't set external-ids in master codepaths

The only external-ids that ovn-kubernetes sets in the OVS
database are used by ovn-controller on the node, not the master.

Signed-off-by: Dan Williams <aeade43d0f8ae14e7c44fa81fe17c1635ae376fe@redhat.com>

shettyg/ovn-kubernetes,shettyg/ovn-kubernetes,shettyg/ovn-kubernetes