Include UNKNOWN SIP Direction as part of Protobuf best practicies

Fixes: 214426017
Test: proto def change
Change-Id: I672a93618837e7abef1f9f5bf43dc9bf78033cbc
1 file changed
tree: b479d06ec91f7294ee69b340a5e5fb381f889cfe
  1. stats/
  2. OWNERS