Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Add "volumes" parameter in Kubernetes context"
  - Add "volumes" parameter in Kubernetes context
    
    This new parameter, "volumes", will allow the user to automatically create
    new volumes. Example of Kubernetes context definition:
    
      context:
        type: Kubernetes
        servers:
          host:
            image: ...
            commands: ...
            volumes:
              - name: volume1              # mandatory
                <volume type definition>   # mandatory
    
    The volume type and the definition must be one of the supported ones in
    Kubernetes [1].
    
    [1] https://kubernetes.io/docs/concepts/storage/volumes/#types-of-volumes
    
    JIRA: YARDSTICK-1152
    
    Change-Id: I44a91c605f047de4f286407e28fb5aa2e921b00a
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>
    

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