Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Stop triggering the verify job if there is no code change

    The job doesn't need to be triggered if there is no code change, eg
    commit message updates.

    The remnants of previous directory structure is also removed from
    gerrit trigger/forbidden-file-paths.

    Change-Id: I68b9e70d0d70253d7fbad95f8dedaaa63fb2b26e
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>