Add ownersFileName and test, clean up doc and code.

* Set ownersFileName to change default name OWNERS for a project or globally.
* Update config.md and fix an error description about addDebugMsg.
* Group Config variables and constants in Config.java.

Change-Id: I692e0d15831fb0a8872cb4f6110a44cf100d3adf
5 files changed
tree: ed741e344f0de8b555145e36918a80c30bd85813
  1. src/
  2. BUILD
  3. LICENSE
  4. OWNERS