Update git submodules

Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to e557da789934f37432c4b462402a3cd687a44af7
  - Fix linter issues in soutils.py vcp librabry

    Change-Id: I6adaa992fe9c2411025eb28edafef83b506bac29
    Issue-ID: INT-1427
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
  - Fix Python linting issues in Python scripts

    Fixed pylint issues for categories trailing-whitespace,
    trailing-newlines, syntax-error, unused-import.

    Change-Id: Iccbdb0c9538a6b8299c0517bafa1ec1be30f07cd
    Issue-ID: INT-1427
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>