Update git submodules

* Update docs/submodules/dmaap/datarouter.git from branch 'master'
  to 15b5a700e4d2ea3572d38ccf1a8120040e23a038
  - Merge "Remove critical code smells for utils classes"
  - Remove critical code smells for utils classes
    
    Change-Id: I8b4012a055d34a54a58046edef7dc539428832be
    Issue-ID: DMAAP-1195
    Signed-off-by: econwar <conor.ward@est.tech>
    
1 file changed