Update git submodules
Update git submodules

* Update plugins/hooks from branch 'stable-3.0'
  to 072ee210f38f4c1bdc55330e88dc844b4daad6ca
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Fix and clarify documentation of ref-update and commit-received hooks
      Correct documentation of ref-update hook regarding output
    
    Change-Id: Ia446c95e1f6ca12e1cbd198d3a7e4f6a16b09fc6
    
  - Fix and clarify documentation of ref-update and commit-received hooks
    
    - Clarify behavior of ref-update when multiple commits are pushed, i.e.
      that it is only called once for the entire ref update.
    
    - Fix the documentation of commit-received which states that it is called
      for changes pushed for review. In fact it is also called for direct
      pushes, but unlike ref-update it is called once for each commit.
    
    Change-Id: Ie3e2dcab37eeb5d0ed06e05322e72d3fc73925fd
    
  - Correct documentation of ref-update hook regarding output
    
    The output of the hook is only returned when the update is rejected,
    not regardless of the return code as stated in the doc.
    
    Change-Id: I93483f44e31e7055c302c0758084de868d1c4f93
    
GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit