add support for channel config being nested

this adds support for the channel config being nested, and provides
the basis for moving message catalog out of the code and into the
yaml in a new nested section.

Change-Id: I7353af4c3f141d4bd617d6fd388d7957e0586ba8

elastic_recheck/bot.py

@@ -217,6 +217,11 @@ class RecheckWatch(threading.Thread):
 class ChannelConfig(object):
     def __init__(self, data):
         self.data = data
+        # for compatibility reasons we support a pre channel hierarchy
+        # model of the world.
+        if 'channels' in data:
+            self.data = data['channels']
+
         keys = data.keys()
         for key in keys:
             if key[0] != '#':

recheckwatchbot.yaml

@@ -1,19 +1,18 @@
-openstack-nova:
-    projects:
-      - nova
-    events:
-      - positive
-
-openstack-glance:
-    projects:
-      - glance
-    events:
-      - positive
-
-openstack-qa:
-    projects:
-      - all
-    events:
-      - positive
-      - negative
+channels:
+    openstack-nova:
+      projects:
+        - nova
+      events:
+        - positive
+    openstack-glance:
+      projects:
+        - glance
+      events:
+        - positive
+    openstack-qa:
+      projects:
+        - all
+      events:
+        - positive
+        - negative