Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to b6e82755d6b3454951d3627dd3f51a0e2a50f49b
  - Merge "update bbinputsetup to handle volume group replace"
  - update bbinputsetup to handle volume group replace

    update bbinputsetup to handle volume group replace
    fixed unit tests and updated related instance check
    updated fetch of volume group in mapper layer

    Issue-ID: SO-2682
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I48266f9e7e681a4fc31a8732aa06efb95bfb01b5