bgpd: Fix aggregation issues found via ANVL

There were various failures in ANVL's aggregation tests, this
patch fixes those issues found

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 54ff544..616f779 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -717,6 +717,7 @@
   return new;
 }
 
+/* Create the attributes for an aggregate */
 struct attr *
 bgp_attr_aggregate_intern (struct bgp *bgp, u_char origin,
 			   struct aspath *aspath,