Finish the build logs archiver, add handlers for cloud and local that handle gzip encoded archived content.

data/buildlogs.py

@@ -51,6 +51,13 @@ class RedisBuildLogs(object):
     except redis.ConnectionError:
       raise BuildStatusRetrievalError('Cannot retrieve build logs')
 
+  def delete_log_entries(self, build_id):
+    """
+    Deletes the logs and status keys completely.
+    """
+    self._redis.delete(self._logs_key(build_id))
+
+
   @staticmethod
   def _status_key(build_id):
     return 'builds/%s/status' % build_id