Update git submodules

Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 6fd28af38ec8f90445bbcb0e5fa2328f428da4a8
  - Merge "Remove restriction on mapping String values only"
  - Remove restriction on mapping String values only

    Correct the JUnits to address userParams non-String values
    Remove restriction on mapping of String values only for userParams in
    BB RequestContext.

    Change-Id: I8a0d30e61618c275301d62bf04c064bea56c1b4d
    Issue-ID: SO-1593
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>