Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "Remove AnsibleCommon class method mock" into stable/fraser
  - Remove AnsibleCommon class method mock

    In [1], several methods in "AnsibleCommon" class are mocked, but those
    mocks are not removed after the test execution. Depending on the test
    execution order, this affects other results.

    [1] https://github.com/opnfv/yardstick/blob/stable/fraser/yardstick/tests/unit/service/test_environment.py#L20

    JIRA: YARDSTICK-1214

    Change-Id: I85ef702b3b5b2fda5cf453a21b9f0bec61b155f0
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>
    (cherry picked from commit e204c5063ab86d4ed2bff296959afae43866890f)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index fb641de..980ff9b 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit fb641dea618c5b2530abf1e920f3f599de9eb59b
+Subproject commit 980ff9b7b35bbb021c7d4cd2b9bc6a2a0b7eaa09