Fix tag announcement.

All tags were announced with a ttl of None.

ccnode/tags.py

@@ -312,7 +312,7 @@ class TagDB(object):
 
     def rpc_register_tag(self, tag):
         logger.debug('RPC register tag %s', tag.name)
-        ttl = None if tag.ttl == -1 else None
+        ttl = None if tag.ttl == -1 else tag.ttl
         self.rpc_call(tag.name, self.rpc_tag_register_cb, 'tags_register',
                       tag.name, ttl, tag.value)
 
@@ -333,7 +333,7 @@ class TagDB(object):
 
     def rpc_register_sub_tag(self, sub_id, tag):
         logger.debug('RPC register tag %s(%s)', tag.name, sub_id)
-        ttl = None if tag.ttl == -1 else None
+        ttl = None if tag.ttl == -1 else tag.ttl
         self.rpc_call(tag.name, self.rpc_sub_tag_register_cb,
                       'sub_tags_register', sub_id, tag.name, ttl, tag.value)