Update git submodules

Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Parse "dispatcher" options correctly from InfluxDB client"
  - Parse "dispatcher" options correctly from InfluxDB client

    The InfluxDB client needs first to retrieve which dispatchers
    are available from "DEFAULT:dispatcher". This parameter accepts
    comma separated values. "get_data_db_client" method needs to search
    for "influxdb" in this string parameter.

    JIRA: YARDSTICK-1136

    Change-Id: I5efafcffbd3dbf906ca9bebd75b3717df8bbb75d
    Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>