Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to d230e3bf3495156651b39f03a2bc7e17324ce269
  - Check if existing Pnf is related to service instance
    
    Issue-ID: SO-2937
    Signed-off-by: Mateusz Harazin <mateusz.harazin@nokia.com>
    Change-Id: I3e1e8b7534c1ffa36b0383b52ca9ea547f5bac7e
    
1 file changed