Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 5184b28f6ec1170ae035ddd749d8bdf5b2064904
  - Merge "Enhanced List Level flow with backward support"
  - Enhanced List Level flow with backward support

    Modified the e2e service instance flow to
    support both new list types groups along with
    backward compatibility to support old types
    alloted resources, network etc.

    Change-Id: Ie8fc8a4550a90b44736b6b9de058e2a2e187570c
    Issue-ID: SO-1393
    Signed-off-by: sarada prasad sahoo <sarada.prasad.sahoo@huawei.com>