Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "cyclictest: use raw strings to escape \[8"
  - cyclictest: use raw strings to escape \[8

    Change-Id: I36d93eacab2470f90af5653104ad5c07853411bf
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index ce4b5b3..49844d2 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit ce4b5b36ffaae02f23b4c560a0b6bf8d7f2dbae0
+Subproject commit 49844d2d7bf43eda8adda6fc6dd48357b736aa39