Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "Migrate install.sh script to ansible" into stable/fraser
  - Migrate install.sh script to ansible

    Ansible scripts to install yardstick.

    These scripts will take a few options:
      INSTALLATION_MODE : Container or Baremetal
      YARDSTICK_DIR: Location of Yardstick directory
      VIRTUAL_ENVIRONMENT: Should a virtual environment be used
      NSB_DIR: Location of NSB directory

    JIRA: YARDSTICK-1126

    Change-Id: I4a13e07e96650ffd971dfb18472f2563cfd51aa9
    Signed-off-by: John O Loughlin <john.oloughlin@intel.com>
    (cherry picked from commit 0b976dd02421a181674acc837127ac741ccfccea)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index efd922d..e57d28d 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit efd922d81c99e44d6c8b39f4ea4668bf9871d02f
+Subproject commit e57d28d462c6b8563e14043c6d2f5ed442639d03