Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[yardstick] debug dump image ID"
  - [yardstick] debug dump image ID

    we need to know if we are pulling stale yardstick/stable images

    for example, if when branching between releases we can
    still be pulling old release yardstick/stable images without
    knowing it.

    This will dump the IMAGE ID of the images we just pulled which
    we can match to Jenkins docker push builds

    Change-Id: I875cf2fd07d17c3eebe294e70f2edccd9f48ce11
    Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>