node data field 'node_id' always has an underscore in its name

modules/ffpb.py

@@ -397,7 +397,7 @@ def ffpb_findnode(name, allow_fuzzymatching=True):
         else:
             nodeid = mac.replace(':', '').lower()
             return {
-                'nodeid': nodeid,
+                'node_id': nodeid,
                 'hostname': '?-' + nodeid,
                 'network': {
                     'addresses': [mac2ipv6(mac, 'fdca:ffee:ff12:132:')],