fix(contrib): re-introduce data dir mapping for etcd

Fix what #4669 and #4444 broke

Author: helgi

contrib/aws/gen-json.py

@@ -105,6 +105,9 @@ def coreos_amis(channel, version):
 # are started
 data['coreos']['units'] = new_units + data['coreos']['units']
 
+# Point to the right data directory
+data['coreos']['etcd2']['data-dir'] = '/media/etcd'
+
 header = ["#cloud-config", "---"]
 dump = yaml.dump(data, default_flow_style=False)