Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'stable/gambia'
  - Merge "Pod file fix for Prox 2 port" into stable/gambia
  - Pod file fix for Prox 2 port

    Removing the "keyfile" from the pod file to align with other
    pod files for 1 and 4 port. The file when used as such currently
    gives an error. This change will fix that.

    JIRA:YARDSTICK-1477

    Change-Id: Ibfa9387d068a0098ea0eb0b31ad96108d0602abc
    Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>
    (cherry picked from commit 31eac948bba5cf442981fdc7b1392992aaef1f15)