Merge branch 'stable-3.4'

* stable-3.4:
  Use null instead of "N/A" as default change-number
  RMQ: Follow new sepia standard for routing-key

Change-Id: I33c6e869e6658c2effa38b4f97ec11e256bd1e45
tree: 753302b27ee2836f31958cc58b92031fe5b3773b
  1. src/
  2. BUILD
  3. external_plugin_deps.bzl