Extend ironic formula

This patch updates ironicng salt module to be able of:

 * list vifs for a given node
 * attach vif for a given node
 * detach vif from a given node
 * deploy user image to node
 * generate configdrive

Fix some default values when enrolling nodes automatically.

Allow to download images from http to conductor http_root.

Change-Id: Id99ad955c8c7256ae10ece7a173242044692e713
diff --git a/metadata/service/client.yml b/metadata/service/client.yml
new file mode 100644
index 0000000..8e33a4b
--- /dev/null
+++ b/metadata/service/client.yml
@@ -0,0 +1,6 @@
+applications:
+  - ironic
+parameters:
+  ironic:
+    client:
+      enabled: True