Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 6ec917f8f6490861a47f2b03a6065cc1da2be1dc
  - Merge "Improvements in JsonUtilForPnfCorrelationId"
  - Improvements in JsonUtilForPnfCorrelationId
    
    General fixes and improvements according to the Sonar analysis
    -Added private constructor for a utility class.
    -Refactored lambda expression.
    
    Issue-ID: SO-1992
    Signed-off-by: Robert Bogacki <r.bogacki@samsung.com>
    Change-Id: Ife8cfdf9c341dc89a1699fd616ec68cba734a5d5
    
1 file changed