Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'stable/fraser'
  - Merge "Fix log typos in benchmark/scenarios/availability" into stable/fraser
  - Fix log typos in benchmark/scenarios/availability

    This commit fixes multiple log message typos and all the emerged pylint
    errors.

    MonitorProcess/MonitorOpenstackCmd.verify_SLA() repeat already logged
    information, so these prints are removed.

    JIRA: YARDSTICK-1145

    Change-Id: Ifef26e4b4ff7766089caec24785511969c2d663e
    Signed-off-by: Miikka Koistinen <miikka.koistinen@nokia.com>
    (cherry picked from commit 6fa51bdcc7ad7e4d407f2803fc05b1cfaf66c115)