Some traffic does not work if the OVS flows to permit custom ethertypes
are not set on the base egress table. If the rule is added to the base
egress table then both ingress and egress work properly. Also move
initialization code to the function to initialize egress.
Related-Bug: #1832758
Change-Id: Ia312fe75df58723bf41804eec4bd918d223bd60c
(cherry picked from commit fb859966f7)