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)

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index d61ecbc..5c2e4ac 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit d61ecbcda464fa91516f4b3555b00ed7fe67da81
+Subproject commit 5c2e4acc1b33decbcd8b49c91edb49d4c2f46972