Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Bugfix:proxy env, ansible multinode support"
  - Bugfix:proxy env, ansible multinode support

    JIRA: YARDSTICK-893

    - hosts and plays in ansible/nsb_setup.yml refactored
    Fixed proxy configuration from env or /etc/environment in nsb_setup.sh
    Fixed ansible parameter 'environment: "{{ proxy_env }}"' in:
     - roles for components download.
     - roles for components dependencies install.

    Now, you can use ansible to modify all yardstick-standalone hosts at once.
    1) Configure http[s]_proxy in
    - /etc/environment
    or
    - env variables
    2) Modify ansible/yardstick-install-inventory.ini:
      [jumphost]
      localhost  ansible_connection=local

      [yardstick-standalone]
      yardstick-standalone-node ansible_host=192.168.1.2
      yardstick-standalone-node-2 ansible_host=192.168.1.3

      [all:vars]
      ansible_user=root
      ansible_pass=root

    3) start:
    ./nsb_setup.sh # for baremetal/sriov
    ./nsb_setup.sh <path to admin-openrc.sh> #for openstack heat

    Change-Id: I167db8bae8303210f21e8ae6f3870ef054bbedce
    Signed-off-by: Malanik Jan <janx.malanik@intel.com>