Include client key in disabled probe list email

rattail_tempmon/emails.py

@@ -137,6 +137,7 @@ class tempmon_disabled_probes(Email):
                 tempmon.Client(config_key='foo', hostname='foo.example.com'),
             ],
             'disabled_probes': [
-                tempmon.Probe(description="north wall of walk-in cooler"),
+                tempmon.Probe(description="north wall of walk-in cooler",
+                              client=tempmon.Client(config_key='bar')),
             ],
         }

rattail_tempmon/templates/mail/tempmon_disabled_probes.html.mako

@@ -12,7 +12,7 @@
         <h3>Disabled Probes</h3>
         <ul>
           % for probe in disabled_probes:
-              <li>${probe}</li>
+              <li>${probe} (for client: ${probe.client.config_key})</li>
           % endfor
         </ul>
     % endif