Update git submodules

Update git submodules

* Update docs/submodules/msb/swagger-sdk.git from branch 'master'
  to 9f6259f1dbc97a14fede598c52d349517e3d1642
  - Merge "Migrate msb-swagger-sdk docs"
  - Migrate msb-swagger-sdk docs

    Merging this will create
    https://onap-msb-swagger-sdk.readthedocs.io
    This build will run in parallel
    to the current docs generation method
    until we are ready to cut over.

    Issue-ID: CIMAN-364
    Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
    Change-Id: Ic47defd4b88de3de9a57196d7bfffb647b6254d9