Ensure backward compatibility with SQLAlchemy<1.4

In Ib6e3ed40dc8b075c3cecb967b7417097e3cab60d, a breaking change was
introduced to suppose SQLAlchemy 1.4.x but this PS ensures backward
compatibility with 1.3.x.

Change-Id: I73ef4f99f02abc8b1083860f34a8a8e084ad96fd

Author: brtkwr

magnum/db/sqlalchemy/api.py

@@ -344,7 +344,7 @@ def get_cluster_template_by_id(self, context, cluster_template_id):
         query = self._add_tenant_filters(context, query)
         public_q = model_query(models.ClusterTemplate).filter_by(public=True)
         query = query.union(public_q)
-        query = query.filter_by(cluster_template_id=cluster_template_id)
+        query = query.filter(models.ClusterTemplate.id==cluster_template_id)
         try:
             return query.one()
         except NoResultFound:
@@ -356,7 +356,7 @@ def get_cluster_template_by_uuid(self, context, cluster_template_uuid):
         query = self._add_tenant_filters(context, query)
         public_q = model_query(models.ClusterTemplate).filter_by(public=True)
         query = query.union(public_q)
-        query = query.filter_by(cluster_template_uuid=cluster_template_uuid)
+        query = query.filter(models.ClusterTemplate.uuid==cluster_template_uuid)
         try:
             return query.one()
         except NoResultFound:
@@ -368,7 +368,7 @@ def get_cluster_template_by_name(self, context, cluster_template_name):
         query = self._add_tenant_filters(context, query)
         public_q = model_query(models.ClusterTemplate).filter_by(public=True)
         query = query.union(public_q)
-        query = query.filter_by(cluster_template_name=cluster_template_name)
+        query = query.filter(models.ClusterTemplate.name==cluster_template_name)
         try:
             return query.one()
         except MultipleResultsFound: