Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 613b4a83493160a19999ecae601f158f342dcbab
  - Merge "update logback configuration to remove stack"
  - update logback configuration to remove stack
    
    Removed stack traces from error logs
    Fixed spelling in error message
    
    Issue-ID: SO-2670
    Signed-off-by: Benjamin, Max (mb388a) <mb388a@att.com>
    Change-Id: I7edc75b2c0b84727fdba3fd6eb893ed7380c613c
    
1 file changed