Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 60501f7fff9310037ca86d507a63978ab57e884e
  - Merge "Remove MsoLogger from 'mso-openstack-adapters'"
  - Remove MsoLogger from 'mso-openstack-adapters'

    Removed MsoLogger from adapters ('mso-openstack-adapters')
    Replaced MsoLogger with plain slf4j
    Refactored login output
    Fixed imports

    Change-Id: Id39453e1a7ec86271ffc1e7d1ce08bf413369a60
    Issue-ID: LOG-631
    Signed-off-by: k.kazak <k.kazak@samsung.com>
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>