Update copyright notice from Swarming to LUCI; add AUTHORS and CONTRIBUTORS.

appengine/gce-backend/models.py

-# Copyright 2015 The Swarming Authors. All rights reserved.
+# Copyright 2015 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 """Datastore models for the Machine Provider messages."""
 
 import hashlib
 
 from google.appengine.ext import ndb
 from google.appengine.ext.ndb import msgprop
 
@@ skipping 113 matching lines @@
   def generate_key(cls, name):
     """Generates the key for an InstanceGroup with the given name.
 
     Args:
       name: Name of this instance group.
 
     Returns:
       An ndb.Key instance.
     """
     return ndb.Key(cls, hashlib.sha1(name).hexdigest())