Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - heat: allow overriding Heat/Neutron private IP for DPDK tests
    
    For some L2/L3 DPDK testcases we need to use a custom
    IP address space different from what Heat provides.
    
    These testcases require port_security_enabled = False so
    Neutron should allow for unrestricted L2 traffic.
    
    This will work because we bind the ports to DPDK and thus
    don't need DHCP.
    
      vnf_0:
        floating_ip: true
        placement: "pgrp1"
        network_ports:
          mgmt:
            - mgmt
          uplink_0:
            - xe0:
                local_ip: 10.44.0.20
                netmask: 255.255.255.0
          downlink_0:
            - xe1:
                local_ip: 10.44.0.30
                netmask: 255.255.255.0
    
    Also fixup flake8 errors in unittests
    
    Change-Id: Id29dfffa692f16fb1f526d208db43e476e2f7830
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
    

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