Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "test_attacker_baremetal: don't run local commands"
  - test_attacker_baremetal: don't run local commands
    
    these tests were failing to mock subprocess.check_output
    and thus were trying to run sudo commands on the local
    system.
    
    This is dangerous.  Add the subprocess mock.
    
    Also mock the LOG object so we don't print
    bogus Runtime error tracebacks in the unittest logs
    when we test assertRaises()
    
    Change-Id: I01535f9952fbd95ce2f5972b641c51ff836e7e8c
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

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