Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "NSBperf: fix bad sigint handler"
  - NSBperf: fix bad sigint handler
    
    This is why we don't do things at module
    import time.
    
    when we import this module it makes a bad
    sigint handler.  Only load signal handlers
    at runtime.
    
    Also fix handler to take *args, **kwargs.
    
    Unittest failures:
    
    >     time.sleep(0.01)
    E     TypeError: handler() takes 0 positional arguments but 2 were given
    
    Change-Id: I4296a4bdef0e5f4d58b0503dcbc834f3bef0feeb
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

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