Updating our versioning guidelines to allow 3 additional types of changes
Updating our versioning guidelines to allow 3 additional types of
changes

1. Patch versions now formally allow expanding conformance test coverage
   This is very important as we're in active development and conformance
   test coverage of existing features  has still not reached 100%. We
   should not wait to add better conformance tests until we have another
   minor release.

2. Minor versions now allow for changes to recommended status conditions
   Importantly this does not include changes to the structure of the
   API, just the values we recommend that implementations set. This also
   includes a corresponding allowance for conformance test changes.

istio/gateway-api,istio/gateway-api,istio/gateway-api