Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Add Ansible executor class for node context
    
    import the AnsibleCommon class to execute Ansible playbooks
    
    Update node context support to use AnsibleCommon
    
    needs unittests
    
    We must call ansible-playbook as an executable, so we must create temp
    files for inventory, and for the playbooks.
    
    AnsibleCommon has evolved to be quite flexible, it auto-generates the
    inventory from the context['nodes'] and generates groups from the node
    Role.
    
    We also support either a single playbook filename, or a list of
    filenames.
    
    If given a list we dynamically generate a playbook that includes the
    other playbooks.
    
    We support adding any number of extra_vars using a temp JSON file.
    
    Also designed to be extended by subclassing.
    
    Change-Id: I5bd0a2b4547feaadd70b7e2b8801f19371b99df0
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

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