Integrate cord-onos-publisher

Added cord-onos-publisher as "participating submodule".
- tested fetch, buildImages, and publish
- verified that "mavenrepo" shows up in integration
  docker registry
diff --git a/.gitmodules b/.gitmodules
index d1c5bd7..41b5065 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,3 +4,6 @@
 [submodule "components/cord-tester"]
 	path = components/cord-tester
 	url = ../cord-tester
+[submodule "components/cord-onos-publisher"]
+	path = components/cord-onos-publisher
+	url = ../cord-onos-publisher