Publish top level Maven POMs as part of release build

Change-Id: I6e10d4af4d8b59e3f5e15f001d160838a3c35266
diff --git a/tools/build/onos-buck-publish b/tools/build/onos-buck-publish
index 0d82c1c..2b137f8 100755
--- a/tools/build/onos-buck-publish
+++ b/tools/build/onos-buck-publish
@@ -39,5 +39,9 @@
 cat $TEST_PUB
 bash $TEST_PUB
 
+# stage ONOS poms
+onos-buck publish --to-maven-central --sign //:top-level-pom
+onos-buck publish --to-maven-central --sign //lib:onos-dependencies-pom
+
 # Close the staging area
 onos-close-staging