Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  Update bazlets to latest stable-2.14 to use 2.14.12 API
  Allow access using Basic Authentication prefix
  Update javamelody-core to 1.74.0
  Prefer Javamelody's own configuration constants

Change-Id: I878592a8c317855be71302b2bc8f912efa140c97