Update git submodules

* Update docs/submodules/dmaap/datarouter.git from branch 'master'
  to 438d13be4982934f8de0700a98fd61172f05d644
  - [DR] Updating frankfurt release notes
    
    Signed-off-by: efiacor <fiachra.corcoran@est.tech>
    Change-Id: I867fb505dd8acba78c954523bb953cb9190b5eb9
    Issue-ID: DMAAP-1434
    
1 file changed