Update git submodules
Update git submodules

* Update plugins/hooks from branch 'stable-2.14'
  to 5df9a9dfdf4b4028393208d4412cc2c1a95fef39
  - Add documentation to help with debugging hook problems
    
    A common problem for users of the plugin is that they are not sure
    if their hooks are actually being executed, and what their output
    is.
    
    Such information is logged by the plugin, but only at debug level.
    
    Add a section in the documentation showing how to enable the logging.
    
    Change-Id: I6e040f958ce4503f5cc0468ebe09466914d4a7eb
    
  - Document behavior of plugin regarding configuration changes
    
    Change-Id: I6509349994fce8405086982ee0d58bd38292ad29
    
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