Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to b6b577995677cc637fb829abd4cb76434af41775
  - Fix for SO-2598
    
    Change-Id: I26a8251bd878d95ae3ede8d27bf9f42a6692e338
    Issue-ID: SO-2598
    Signed-off-by: waqas.ikram <waqas.ikram@est.tech>
    
1 file changed