Merge pull request #3355 from ckan/3354-tests-keep-migrate-table

[#3354] Migrate table is kept during tests

ckan/model/__init__.py

@@ -255,6 +255,8 @@ def delete_all(self):
         else:
             tables = reversed(self.metadata.sorted_tables)
         for table in tables:
+            if table.name == 'migrate_version':
+                continue
             connection.execute('delete from "%s"' % table.name)
         self.session.commit()
         log.info('Database table data deleted')