Adding script to close Nexus staging repo

Change-Id: Ibfcbb6b58159393493e1a4be58d2e2360810d0d6
diff --git a/tools/build/onos-buck-publish b/tools/build/onos-buck-publish
index 53af0e4..24ce932 100755
--- a/tools/build/onos-buck-publish
+++ b/tools/build/onos-buck-publish
@@ -36,4 +36,5 @@
 cat $TEST_PUB
 bash $TEST_PUB
 
-# FIXME Close the staging area
+# Close the staging area
+onos-close-staging
\ No newline at end of file