Enable notifications only for mk20

This patch moves the parameters to configure the collect of
the notifications into a specific YAML file so it can be configured only
for mk20. It is disabled by default because it cannot be used
simultaneously with ceilometer.

https://github.com/Mirantis/mk-lab-salt-model/pull/204
diff --git a/heka/remote_collector/input/amqp.yml b/heka/remote_collector/input/amqp.yml
new file mode 100644
index 0000000..fecd09b
--- /dev/null
+++ b/heka/remote_collector/input/amqp.yml
@@ -0,0 +1,9 @@
+parameters:
+  heka:
+    remote_collector:
+      amqp_host: ${_param:heka_amqp_host}
+      amqp_port: 5672
+      amqp_user: openstack
+      amqp_password: ${_param:rabbitmq_openstack_password}
+      amqp_vhost: '/openstack'
+      amqp_notification_topic: notifications