Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge changes from topics 'YARDSTICK-1250', 'YARDSTICK-1249'

    * changes:
      Fix pip install issues in install.yaml script
      Bump ansible version to 2.5.5

  - Fix pip install issues in install.yaml script

    For long executing commands, ansible should use async jobs. For example,
    when installing the project requirements.

    There is a problem in ansible pip module when using a "editable installs".
    This command should be called with "editable" flag.

    JIRA: YARDSTICK-1250

    Change-Id: I6d29bab2f388373e252d065ff5aa0c459a8f265a
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>
  - Bump ansible version to 2.5.5

    Increase ansible version to 2.5.5.

    There is a closed bug present in version 2.4.2 which affects to some ansible
    scripts. When calling recursively different roles, the maximum recursion
    depth can be exceeded [1]. This bug is fixed in proposed version.

    [1] https://github.com/ansible/ansible/issues/23609

    JIRA: YARDSTICK-1249

    Change-Id: Ia45b6a2ab44203e39c52357eb3cfee1e0c77eed3
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index f33f04d..01711ac 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit f33f04d62d457f1d79fd548514f6831a2ac71a1c
+Subproject commit 01711acbd1a8b9f5bcf20073f33ad6cc83ede970