Update ONOS version to 1.6.0-rc2

Change-Id: I60df1e4c29bf9a14a65d0a19f839c358de4394a6
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a4f1f28
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+*~
+*.class
+.classpath
+.project
+.settings
+.checkstyle
+target
+*.iml
+.idea