Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Fix PEP8 errors in prox_binseach"
  - Fix PEP8 errors in prox_binseach

    There were some pep8 errors in the
    prox_binsearch.py file. These are fixed here.

    JIRA: YARDSTICK-1173

    Change-Id: I817bba89c6ba298bb0f27b2538aa7585cb286754
    Signed-off-by: Abhijit Sinha <abhijit.sinha@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 789a6e6..d984fd8 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 789a6e66d0c2f6fe2244ddd00b9841635756e00f
+Subproject commit d984fd894a50d1aebb4608c0efc87a549f003215