Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge changes from topic 'prox-stable/fraser' into stable/fraser
    
    * changes:
      NSB NFVi PROX BNG losing many packets
      NSB NFVi PROX VPE losing many packets
      Decrease Sampling interval
      Addition of Configurable Sampling and Configurable Confirmation Retry
    
  - NSB NFVi PROX BNG losing many packets
    
    JIRA: YARDSTICK-1101
    
    Problem was incorrect generator and changed the traffic profile to allow
    a tolerated loss of 5%.
    
    ARP packets are not managed (just passed thru the system) therefor the
    tolerated loss must be higehr than normal.
    
    Change-Id: I03bd62b397a66b50961e810d033c6894d0b3e9a6
    Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
    (cherry picked from commit 48c9e48dcff498c8f51ec507d4107bc658b82d82)
    
  - NSB NFVi PROX VPE losing many packets
    
    JIRA: YARDSTICK-1105
    
    Running a vPE test ends up with up to 25% drooped packets.
    This is due to tolerated loss being incorrectly configured,
    test duration was too short and test interval was too
    short.
    
    Note This is due to the fact that vPE use case have by
    default a tolerated loss of 100%, Now changed to 0.001,
    same as L2FWD
    
    Also: Grafan dashboard has been updated to show all SUT
    CPUS Utilization in 1 panel. And LINE rate MIN, MAX & TEST
    Rate have been added
    
    Change-Id: I7adae2199b3f656fe460705b6aeb3aa69c767d50
    Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
    (cherry picked from commit 39b3d9ae8ff19a0d64bff0e874f05b6dbcc30b01)
    
  - Decrease Sampling interval
    
    JIRA: YARDSTICK-1219
    
    Currently NSB for NFVI using PROX returns sampling information every 13
    seconds.
    
    This is too slow.
    
    It is required to return sampling information form Generator AND VNF at
    least every  1 second.
    
    This change is depandant on JIRA: YARDSTICK-1212 and YARDSTICK-1220
    
    Change-Id: Ica7ab795a2919d191d8cd846d028e15739e33fb7
    Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
    (cherry picked from commit f8b45aca386ed5852d9568c531ba4595c68cc0e2)
    
  - Addition of Configurable Sampling and Configurable Confirmation Retry
    
    JIRA: YARDSTICK-1221
    
    In order to increase accuracy of result the following are done :-
      - Improve Measurement Accuracy (YARDSTICK-1212)
      - Improve Sampling Interval (YARDSTICK-1219)
      - Allow 4 PROX ports to be read simultaneously (YARDSTICK-1220)
    
    This change does the following :-
      - Stores LINE Rate statistics of Sample
      - Requires a confirmation retry before deciding to increase or
        decrease this is configurable.
      - Allows the user to disable Sampling or specify a sample interval
      - Added Code Coverage of ProxDurationRunner based on YARDSTICK-1199
    
    Change-Id: I27242ac1849c9a2712866385b5fbc05977c71516
    Signed-off-by: Daniel Martin Buckley <daniel.m.buckley@intel.com>
    (cherry picked from commit 2e447af9a5a54355aa20028813660d07d1bd2e18)
    

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