Adding "onos" alias

Change-Id: I4d5097b77566f85f3935f048c2e43a47fe558226
diff --git a/.buckconfig b/.buckconfig
index 2dc3441..ab7460b 100644
--- a/.buckconfig
+++ b/.buckconfig
@@ -5,6 +5,9 @@
   source_level = 8
   target_level = 8
 
+[alias]
+    onos = //:onos
+
 [download]
   maven_repo = https://repo1.maven.org/maven2
   in_build = true