Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 651c1973691d2ab9c2fe12cf7dcdb19b5ef399cd
  - Merge changes from topic "data-download-refactor"

    * changes:
      Refactor download.py and remove not used files
      Refactor of rpm downloading
      Refactor pypi packages download
      Refactor and improve git repository cloning
      Refactor and improve docker image downloading
      Refactor npm packages download
      Refactor http files download

  - Refactor download.py and remove not used files

    Final commit in download refactoring series.

    Issue-ID: OOM-1803

    Change-Id: I5b71908903ef131b8c16d08225c4d2e2de655130
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
  - Refactor of rpm downloading

    Issue-ID: OOM-1803

    Change-Id: Ic1efb371409daddd5910e067ad1f0a85cc7db4ab
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
  - Refactor pypi packages download

    Issue-ID: OOM-1803

    Change-Id: I65056208ed3e89777c3511650f8a5aab7396043b
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
  - Refactor and improve git repository cloning

    Issue-ID: OOM-1803

    Change-Id: Ia8e222c2b70b58ed1f7dbc4254ea2f5cb5a9ef7b
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
  - Refactor and improve docker image downloading

    Issue-ID: OOM-1803

    Change-Id: I4e648d49835faa60165725d1ca4ec22ba1e3e12b
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
  - Refactor npm packages download

    Series of commits to improve python download
    scripts.

    Issue-ID: OOM-1803

    Change-Id: I199660ab121038780c34065f78538bb4e7b07eb5
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>
  - Refactor http files download

    Original download scripts got out of hand.
    This series of commits improves style of code
    (code duplicates, etc.)

    Issue-ID: OOM-1803

    Change-Id: I7b82c1711d27fe450430fbe6d962a450301b0be0
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>