Add imap delete config to lpmqtt and remove ssl

We need to conserve space on the disk of firehose, this commit sets
lpmqtt to delete emails after it processes them.

Change-Id: I3c917df78e27762efcbf5ce07766702380ae2cc5

modules/openstack_project/manifests/firehose.pp

@@ -95,6 +95,7 @@ class openstack_project::firehose (
     imap_hostname => $imap_hostname,
     imap_username => $imap_username,
     imap_password => $imap_password,
-    imap_use_ssl  => true,
+    imap_use_ssl  => false,
+    imap_delete_old => true,
   }
 }