gerrit 2.7-rc1
Merge branch 'stable-2.6' into stable-2.7

* stable-2.6:
  Bump openid4java dependency to 0.9.8
  Provide direct link to REST API documentation
  init: Gracefully handle missing browser
  Improve explanation of path conflicts in project config doc
  init: Don't set username on upgrade if database.type is JDBC