Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Migrate install.sh script to ansible"
  - 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>