Strip trailing slash from BLENDER_ID_ENDPOINT and removed SystemUtility

The xxxUtility classes are silly, they should be removed or replaced
by Python modules.

pillar/application/utils/authentication.py

@@ -1,4 +1,3 @@
-import os
 import logging
 
 import requests
@@ -14,16 +13,11 @@ from application import app
 log = logging.getLogger(__name__)
 
 
-class SystemUtility():
-    def __new__(cls, *args, **kwargs):
-        raise TypeError("Base class may not be instantiated")
-
-    @staticmethod
 def blender_id_endpoint():
     """Gets the endpoint for the authentication API. If the env variable
     is defined, it's possible to override the (default) production address.
     """
-        return app.config['BLENDER_ID_ENDPOINT']
+    return app.config['BLENDER_ID_ENDPOINT'].rstrip('/')
 
 
 def validate(token):
@@ -39,7 +33,7 @@ def validate(token):
     payload = dict(
         token=token)
     try:
-        url = "{0}/u/validate_token".format(SystemUtility.blender_id_endpoint())
+        url = "{0}/u/validate_token".format(blender_id_endpoint())
         log.debug('POSTing to %r', url)
         r = requests.post(url, data=payload)
     except requests.exceptions.ConnectionError as e: