Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Modify fuel_baremetal pod config file"
  - Modify fuel_baremetal pod config file

    The current HA testcases failed on fuel baremetal installer
    with reason "SSHTimeout". This is due to incorrect ssh login
    info in the pod config file. The change is to by running
    'prepare_env.sh' script to

    - read env vars 'USER_NAME' and 'SSH_KEY'
    - replace the 'node_username' to env var 'USER_NAME'
    - replace the "node_keyfile" to env var 'SSH_KEY'

    JIRA: ARMBAND-317

    Change-Id: I0239892f447ae99ab4025eedcd133e1b6f04e5a5
    Signed-off-by: ting wu <ting.wu@enea.com>