Rearrange and rename application routes.

- move application routes to their own Flask blueprint
- squash application routes to be resource-specific
- reorganize application routes

atst/domain/environment_roles.py

@@ -1,9 +1,7 @@
 from flask import current_app as app
-from sqlalchemy.orm.exc import NoResultFound
 
 from atst.database import db
-from atst.domain.exceptions import NotFoundError
-from atst.models import EnvironmentRole, Environment, Application
+from atst.models import EnvironmentRole
 
 
 class EnvironmentRoles(object):
@@ -15,23 +13,6 @@ class EnvironmentRoles(object):
         app.csp.cloud.create_role(env_role)
         return env_role
 
-    @classmethod
-    def get_for_portfolio(cls, user_id, environment_id, portfolio_id):
-        try:
-            return (
-                db.session.query(EnvironmentRole)
-                .join(Environment, EnvironmentRole.environment_id == Environment.id)
-                .join(Application, Environment.application_id == Application.id)
-                .filter(
-                    EnvironmentRole.user_id == user_id,
-                    EnvironmentRole.environment_id == environment_id,
-                    Application.portfolio_id == portfolio_id,
-                )
-                .one()
-            )
-        except NoResultFound:
-            raise NotFoundError("environment_role")
-
     @classmethod
     def get(cls, user_id, environment_id):
         existing_env_role = (