Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Enable multi-port perf in trex as TG
    
    set TRex -c option for threads per port based on
    hardware number of queues.
    
    We can't auto-detect number of queues and we can't
    use more than one thread per core on systems with single-queue
    interfaces, so move the option to the config file
    
    options:
      tg_0:
        queues_per_port: 2
    
    also enable trex debug by removing >/dev/null redirection
    
    options:
      tg_0:
        trex_server_debug: true
    
    Change-Id: I46da187849282bf28f4ef5b333e1ae890e202768
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

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