Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Combine generic and external scenario determination to one"
  - Combine generic and external scenario determination to one

    Previously we were determining the impacted generic scenario by looking into
    changeset in releng-xci. Since we moved the scenarios to releng-xci-scenarios,
    this is not needed anymore and same function can be used for determining the
    scenario.

    Change-Id: I06a65599e03dff4016d0d9d78116e505d84b5061
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>