Update git submodules
Update git submodules

* Update plugins/hooks from branch 'master'
  to 492887449bf66b0f828aa26506629a8f5838f4d3
  - Merge branch 'stable-2.16'
    
    * stable-2.16:
      Fix source glob in test rule
      Add stub module for integration tests
    
    Change-Id: I605ae589a6ce1e21c157d9e313b88e961074ba4c
    
  - Fix source glob in test rule
    
    The glob was only matching files with the name *Test.java which did not
    include HooksIT.java, hence the test was not being executed when run on
    the command line with "bazel test".
    
    Change-Id: If593ad52c24ddd1f633a399f59204fa2a48b0359
    
  - Add stub module for integration tests
    
    The initial version only includes an empty test. The purpose is only to
    ensure that the plugin can be loaded. The test fails if the fix that was
    done in change I621573b52 is reverted.
    
    Additional tests of the plugin's actual functionality may be added later.
    
    Bug: Issue 10132
    Change-Id: Ie64b2c686e8003b456fcad68de9e1c33a98fd2cc
    
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