Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Omit functional tests from coverage report analysis"
  - Omit functional tests from coverage report analysis

    Coverage report will also search for new code introduced in
    /yardstick/tests/functional. Any modification in functional
    test cases must be omitted from coverage report.

    JIRA: YARDSTICK-1308

    Change-Id: Ib9c48102340f70d8d79f78dc81cbfe7b29c81115
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index 898ecf0..6c0dccb 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit 898ecf01748fb4d3f733e3e7a4cfec38fe995f10
+Subproject commit 6c0dccb32f6b22cd295d0a5e5cb296c6defcfed1