Merge branch 'stable-5.4' into stable-5.5

Merge branch 'stable-5.4' into stable-5.5

* stable-5.4:
  Fix string format parameter for invalidRefAdvertisementLine
  WindowCache: add metric for cached bytes per repository
  pgm daemon: fallback to user and system config if no config specified
  WindowCache: add option to use strong refs to reference ByteWindows
  Replace usage of ArrayIndexOutOfBoundsException in treewalk
  Add config constants for WindowCache configuration options

Change-Id: I76a62da98182f0c504b1ea8b7d37cecdf4eea7e0