Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to ab25d660c9c6b948f0ab035167e95893b7e8e667
  - Add bpmn workflow for deleting slice service
    
    Issue-ID: SO-2368
    
    Signed-off-by: zm330 <zhangminyj@chinamobile.com>
    Change-Id: Ie67bd6a51a602105857b0a85faa8ee2122fce29e
    
1 file changed