Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "[userguide] Use literalinclude directive in 05-operation" into stable/fraser
  - [userguide] Use literalinclude directive in 05-operation

    Uses literalinclude directive instead of having a copy of the file content in documentation.
    This means that any update to this file is detected, and the most up-to-date content is used.

    If a testcase is updated, the updates wil be picked up.
    The examples used are ones that are tested reqularly.

    JIRA: YARDSTICK-1066

    Change-Id: I15d967eb04d1e6f4348683d8746fa9989dceda94
    Signed-off-by: Emma Foley <emma.l.foley@intel.com>
    (cherry picked from commit ee9995c42368ee04ba06cd101b086c57dbbb3bba)