Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 050833974a65ce6000f887176e803e373bb2cace
  - Merge "Fix build guide/script regarding python versioning"
  - Fix build guide/script regarding python versioning

    Specify minimal docker release in build/requirements.txt
    and build/download/requirements.txt, not a fixed one.

    Change interpreter for build/package.py as it's Python 3
    compliant.

    Change-Id: I4352aa957371ce85bdea021101ed2f5994f9eedb
    Issue-ID: OOM-1979
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>