Update ONOS version to 1.6.0-rc2

Change-Id: I5ed442fe65b7d48a8baa2daa3dc4d9410647c8c4
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