dmq-node: renamed dmq-test component as dmq-tests

This is inline with other testing component in `ouroboros-network`
repository.

Author: coot

dmq-node/dmq-node.cabal

@@ -141,7 +141,7 @@ executable dmq-node
   hs-source-dirs: app
   default-language: Haskell2010
 
-test-suite dmq-test
+test-suite dmq-tests
   import:
     warnings,
     extensions