Delete old "license" checking code arounds user counts

This is legacy code that doesn't actually do anything of value

data/model/user.py

@@ -12,7 +12,7 @@ from data.database import (User, LoginService, FederatedLogin, RepositoryPermiss
                            UserRegion, ImageStorageLocation)
 from data.model import (DataModelException, InvalidPasswordException, InvalidRobotException,
                         InvalidUsernameException, InvalidEmailAddressException,
-                        TooManyUsersException, TooManyLoginAttemptsException, db_transaction,
+                        TooManyLoginAttemptsException, db_transaction,
                         notification, config, repository, _basequery)
 from util.names import format_robot_username, parse_robot_username
 from util.validation import (validate_username, validate_email, validate_password,
@@ -31,18 +31,11 @@ def hash_password(password, salt=None):
   return bcrypt.hashpw(password.encode('utf-8'), salt)
 
 
-def is_create_user_allowed():
-  return True
-
-
 def create_user(username, password, email, auto_verify=False):
   """ Creates a regular user, if allowed. """
   if not validate_password(password):
     raise InvalidPasswordException(INVALID_PASSWORD_MESSAGE)
 
-  if not is_create_user_allowed():
-    raise TooManyUsersException()
-
   created = create_user_noverify(username, email)
   created.password_hash = hash_password(password)
   created.verified = auto_verify
@@ -307,9 +300,6 @@ def list_entity_robot_permission_teams(entity_name, include_permissions=False):
 
 def create_federated_user(username, email, service_name, service_ident,
                           set_password_notification, metadata={}):
-  if not is_create_user_allowed():
-    raise TooManyUsersException()
-
   new_user = create_user_noverify(username, email)
   new_user.verified = True
   new_user.save()