Drop formatStatusHTML() methods

The HTML build-in /status page used to report a nicely crafted HTML
report of the jobs being run.  It has been removed when switching to
Gearman (1f4c2bb1046).  We now provide a /status.json and an example
webapp to format the json.

The formatStatusHTML() methods did not get cleaned up.

Change-Id: I3051e81894461fc95d7cc238df1139b939fe01a2
diff --git a/zuul/model.py b/zuul/model.py
index c5c5c7d..9d8ff53 100644
--- a/zuul/model.py
+++ b/zuul/model.py
@@ -245,17 +245,6 @@
             items.extend(shared_queue.queue)
         return items
 
-    def formatStatusHTML(self):
-        ret = ''
-        for queue in self.queues:
-            if len(self.queues) > 1:
-                s = 'Change queue: %s' % queue.name
-                ret += s + '\n'
-                ret += '-' * len(s) + '\n'
-            for item in queue.queue:
-                ret += self.formatStatus(item, html=True)
-        return ret
-
     def formatStatusJSON(self):
         j_pipeline = dict(name=self.name,
                           description=self.description)
diff --git a/zuul/scheduler.py b/zuul/scheduler.py
index 55b1624..ae74066 100644
--- a/zuul/scheduler.py
+++ b/zuul/scheduler.py
@@ -849,29 +849,6 @@
             return
         pipeline.manager.onMergeCompleted(event)
 
-    def formatStatusHTML(self):
-        ret = '<html><pre>'
-        if self._pause:
-            ret += '<p><b>Queue only mode:</b> preparing to '
-            if self._exit:
-                ret += 'exit'
-            ret += ', queue length: %s' % self.trigger_event_queue.qsize()
-            ret += '</p>'
-
-        if self.last_reconfigured:
-            ret += '<p>Last reconfigured: %s</p>' % self.last_reconfigured
-
-        keys = self.layout.pipelines.keys()
-        for key in keys:
-            pipeline = self.layout.pipelines[key]
-            s = 'Pipeline: %s' % pipeline.name
-            ret += s + '\n'
-            ret += '-' * len(s) + '\n'
-            ret += pipeline.formatStatusHTML()
-            ret += '\n'
-        ret += '</pre></html>'
-        return ret
-
     def formatStatusJSON(self):
         data = {}