Update git submodules
Update git submodules

* Update plugins/hooks from branch 'master'
  - Refactor: Make Hook an abstract class
    
    Reduce visibility of Hook and AsynchronousHook to package private.
    
    Make Hook an abstract class, defining abstract "execute" methods.
    
    Rename the "run" and "submit" methods in SynchronousHook and
    AsynchronousHook to "execute" to override that defined in Hook.
    
    Change-Id: I4f69aeb8cce336a5765d784a2a7e793743a33ad7
    
  - Refactor: Convert HookArgs to use guava Factory interface
    
    Instead of injecting all of the HookArgs dependencies into the
    HookFactory and then explicitly passing them into the HookArgs
    constructor, inject the dependencies into HookArgs itself and let
    it be created using the guava Factory interface.
    
    This allows to remove several injected members from HookFactory
    that were only necessary for creation of HookArgs. Having these
    members only in HookArgs, where they are actually used, is cleaner.
    
    Change-Id: I56fa559d37c625c5c2c7e36e3ec58d3dd5f19462
    
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