Add .gitignore files

- ignore configuration file we generate by onos.sh setup
- ignore javah generated header

Change-Id: I78f24e89cf4f9faf02f9ae27e741e61b9a9ed578
diff --git a/conf/.gitignore b/conf/.gitignore
new file mode 100644
index 0000000..6fc1c11
--- /dev/null
+++ b/conf/.gitignore
@@ -0,0 +1,2 @@
+*.bak
+zoo.cfg