Metadata Modification

Change the filter function to enable backup of all volume if no metadata key is provided in conf file.
diff --git a/staffeln/conductor/backup.py b/staffeln/conductor/backup.py
index a005a72..c393866 100755
--- a/staffeln/conductor/backup.py
+++ b/staffeln/conductor/backup.py
@@ -73,7 +73,7 @@
     def filter_by_server_metadata(self, metadata):
 
         if not CONF.conductor.backup_metadata_key in metadata:
-            return False
+            return True
 
         return metadata[CONF.conductor.backup_metadata_key].lower() == constants.BACKUP_ENABLED_KEY