Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[fuel] Retire 'BRIDGE' slave param"
  - [fuel] Retire 'BRIDGE' slave param

    Only Danube still uses this param, newer branches rely on IDF.
    Going forward, the `-B` deploy arg will be deprecated in Fuel.

    Do not yet remove BRIDGE slave params from non-CI PODs, as
    other installers (or custom Danube jobs?) might still use them.

    Change-Id: I6d259299d1e13e8a5da732aca60b1f56b8472af6
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>