Replaced nexusproxy property with onap.nexus.url

Also removed redefined redefined nexusproxy and distribution Management from poms
Update ReadMe accordingly

Issue-ID: CPS-435

Change-Id: I02831e737587a1a16e9743773f2840c209d1fffd
Signed-off-by: mkerrigan <michael.kerrigan@est.tech>
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>
diff --git a/docker-compose/docker-compose.yml b/docker-compose/docker-compose.yml
index f01d12d..6267834 100755
--- a/docker-compose/docker-compose.yml
+++ b/docker-compose/docker-compose.yml
@@ -36,7 +36,7 @@
 
   #ncmp-standalone:
   #  container_name: cps-ncmp
-  #  image: onap/cps-ncmp:${VERSION:-latest}
+  #  image: ${DOCKER_REPO:-nexus3.onap.org:10003}/onap/cps-and-ncmp:${VERSION:-latest}
   #  ports:
   #    - "8882:8080"
   #  environment:
@@ -51,7 +51,7 @@
 
   cps-and-ncmp:
     container_name: cps-and-ncmp
-    image: onap/cps-and-ncmp:${VERSION:-latest}
+    image: ${DOCKER_REPO:-nexus3.onap.org:10003}/onap/cps-and-ncmp:${VERSION:-latest}
     ports:
       - "8883:8080"
     environment: