Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'stable/gambia'
  - Merge "Add test library name update in DMF and mainflows" into stable/gambia
  - Add test library name update in DMF and mainflows

    Add automatic update of traffic profile items library name update, as well
    as update of session profile Dmf library name, to avoid the need of user
    changing it in template files.

    Update affected unit tests.

    JIRA: YARDSTICK-1474

    Change-Id: I18cc8ca99a47da862753329c87d1a560a97f76fa
    Signed-off-by: Orest Voznyy <orestx.voznyy@intel.com>
    (cherry picked from commit 1fd3806d6a6bac19f3173da4d6cb94cef81fd7f5)