Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Fix log typos in benchmark/scenarios/availability"
  - 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>

diff --git a/docs/submodules/yardstick b/docs/submodules/yardstick
index a2fffa7..bd2e772 160000 (submodule)
--- a/docs/submodules/yardstick
+++ b/docs/submodules/yardstick
@@ -1 +1 @@
-Subproject commit a2fffa7d4b021cdb690345689a4131300650c952
+Subproject commit bd2e77258aaf24a0f379623c24971774d4c04caf