Add *.orig to .gitignore

Change-Id: I8edb50e13d17e30d0eb3d51dc39590f473a84fff
diff --git a/.gitignore b/.gitignore
index 78c2e67..59ed598 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,3 +67,6 @@
 # Others
 .stestr
 tempest.log
+
+# Git
+*.orig