Move auth decorators into a decorators module

The non-decorators will be broken out in the followup change

endpoints/bitbuckettrigger.py

@@ -4,7 +4,7 @@ from flask import request, redirect, url_for, Blueprint
 from flask_login import current_user
 
 from app import app
-from auth.process import require_session_login
+from auth.decorators import require_session_login
 from buildtrigger.basehandler import BuildTriggerHandler
 from buildtrigger.bitbuckethandler import BitbucketBuildTrigger
 from data import model