Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 3081381bb2ba253fc0aa34203c90ea8bf63b26b4
  - Merge changes Ia52d9db2,Iab16430b

    * changes:
      Remove unused public access modifier
      Add vfmodule support to e2e service instance

  - Remove unused public access modifier

    Remove unused public access modifier.

    Issue-ID: SO-2212
    Signed-off-by: subhash kumar singh <subhash.kumar.singh@huawei.com>
    Change-Id: Ia52d9db2dc9b6500954f516cf456240f4b9e1bf0

  - Add vfmodule support to e2e service instance

    Parse vfmodule to add to resource instance list.

    Issue-ID: SO-2213
    Signed-off-by: subhash kumar singh <subhash.kumar.singh@huawei.com>
    Change-Id: Iab16430b498e505cd89a0ba4c12cfd2f88b9a982