Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Cleanup VsperfDPDKTestCase unit tests"
  - Cleanup VsperfDPDKTestCase unit tests

    Removed unneeded output.

    JIRA: YARDSTICK-1267

    Change-Id: I0a3f25db2c5ef8ed71fd087b6b35641075c121e7
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 500cb61..494810c 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 500cb610a59123be519e100681cc02af21f596f2
+Subproject commit 494810c4d113088069d6d2746bb40f988c583ef3