Update git submodules

Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "Trex_speed_improvement: Add logic for dealing with high speed cards"
  - Trex_speed_improvement: Add logic for dealing with high speed cards

    Adds configuration options and logic to detect maximum supported
    speed of T-Rex server side cards.

    1. Adds logic to pull maximum supported speed from port info
    2. Adds forcable option to have user specify maximum speed
    3. If logic cannot detect speed from port_info because it is
       not available or the forcable option is not set it will
       assume 10G speeds.
    4. Tested on Intel XXV25G and Mellanox ConnectX-5 cards
    5. Added packet structure logging to show packet info for
       better debugging capabilities
    6. Adds core mask to take advantage of multiple cores if
       server is started with more than default number of cores
    7. Adds packets lost logging to RFC2544 Throughput testing

    JIRA: VSPERF-559

    Change-Id: I7fcfda7ccc408c30830950ee3668e01b8624c20a
    Signed-off-by: Christian Trautman <ctrautma@redhat.com>