Update git submodules

* Update docs/submodules/dmaap/datarouter.git from branch 'master'
  to 8f28bfe406b657c924440dcee6e3d7b302ce639c
  - Merge "Adding to unit test coverage"
  - Adding to unit test coverage
    
    Change-Id: Id8d07c94bb70952fb317bfc7824fc0d587087468
    Issue-ID: DMAAP-1203
    Signed-off-by: efiacor <fiachra.corcoran@est.tech>
    
diff --git a/docs/submodules/dmaap/datarouter.git b/docs/submodules/dmaap/datarouter.git
index 8528bac..8f28bfe 160000
--- a/docs/submodules/dmaap/datarouter.git
+++ b/docs/submodules/dmaap/datarouter.git
@@ -1 +1 @@
-Subproject commit 8528bac26723e619901f4020848b2cf05538f43d
+Subproject commit 8f28bfe406b657c924440dcee6e3d7b302ce639c