Update git submodules

* Update docs/submodules/dmaap/messagerouter/messageservice.git from branch 'master'
  to 507bd09b245a79ab7ca9d0f137dffa320afabdf9
  - fix for security vulnerabilities
    
    Issue-ID: DMAAP-986
    Change-Id: Ib048ff20da290bbc8e234f521d46167955d33d1b
    Signed-off-by: su622b <su622b@att.com>
    
1 file changed