Update git submodules

* Update docs/submodules/dmaap/messagerouter/messageservice.git from branch 'master'
  to 91ee8962c8cc6dfcdf480e6be24011b4dc392a5d
  - Merge "add Frankfurt release notes"
  - add Frankfurt release notes
    
    Issue-ID: DMAAP-1419
    Change-Id: I32fc3192c20b1433fe13c70988d694ab68bf3589
    Signed-off-by: su622b <su622b@att.com>
    
1 file changed