Add ironic files to .gitignore

Add pxe booting related files to the .gitignore list

Change-Id: I08cfc98bcdd89f6a9a922f86c86551b661d69fff
diff --git a/.gitignore b/.gitignore
index c6900c8..76ad830 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,7 @@
 files/images
 files/pip-*
 files/get-pip.py*
+files/ir-deploy*
 local.conf
 local.sh
 localrc