Add .gitignore files

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

Change-Id: I78f24e89cf4f9faf02f9ae27e741e61b9a9ed578
diff --git a/src/main/cpp/.gitignore b/src/main/cpp/.gitignore
new file mode 100644
index 0000000..4221363
--- /dev/null
+++ b/src/main/cpp/.gitignore
@@ -0,0 +1 @@
+edu_stanford_ramcloud_JRamCloud.h