Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Proposing Abhijit Sinha as a committer in Yardstick"
  - Proposing Abhijit Sinha as a committer in Yardstick

    Abhijit Sinha has contributed to the Yardstick project in many ways
    Achievements/Contributions include:
    - PROX VNF and TG for NFVi characterization tests
    - Attending Yardstick meetings
    - PROX Grafanfa dashboards

    Change-Id: I455ff22b8cb68c6422fc864659668412bed3e9c4
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 976cf4a..4946bfb 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 976cf4adaa25f68d45719a47ff589815d1559f94
+Subproject commit 4946bfbee16b9738a996d7ec6750caa9c064d156