Unify tokens and subclient tokens

SCST tokens are now stored in the 'tokens' table.
This unifies old token handling and new subclient-specific tokens.
Also ensures the BlenderID expiry of the token is taken into account.

Removes use of httpretty, in favour of responses.

tests/test_auth.py

@@ -1,4 +1,4 @@
-import httpretty
+import responses
 
 from common_test_class import AbstractPillarTest, TEST_EMAIL_USER, TEST_EMAIL_ADDRESS
 
@@ -15,31 +15,31 @@ class AuthenticationTests(AbstractPillarTest):
             auth.create_new_user(TEST_EMAIL_ADDRESS, TEST_EMAIL_USER, 'test1234')
             self.assertEqual('%s1' % TEST_EMAIL_USER, auth.make_unique_username(TEST_EMAIL_ADDRESS))
 
-    @httpretty.activate
+    @responses.activate
     def test_validate_token__not_logged_in(self):
         from application.utils import authentication as auth
 
         with self.app.test_request_context():
             self.assertFalse(auth.validate_token())
 
-    @httpretty.activate
+    @responses.activate
     def test_validate_token__unknown_token(self):
         """Test validating of invalid token, unknown both to us and Blender ID."""
 
         from application.utils import authentication as auth
 
-        self.htp_blenderid_validate_unhappy()
+        self.mock_blenderid_validate_unhappy()
         with self.app.test_request_context(
                 headers={'Authorization': self.make_header('unknowntoken')}):
             self.assertFalse(auth.validate_token())
 
-    @httpretty.activate
+    @responses.activate
     def test_validate_token__unknown_but_valid_token(self):
         """Test validating of valid token, unknown to us but known to Blender ID."""
 
         from application.utils import authentication as auth
 
-        self.htp_blenderid_validate_happy()
+        self.mock_blenderid_validate_happy()
         with self.app.test_request_context(
                 headers={'Authorization': self.make_header('knowntoken')}):
             self.assertTrue(auth.validate_token())