tests: new environment variable to specify default adapter

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2717 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/tests/functional/__init__.py

@@ -215,8 +215,8 @@ class NEOCluster(object):
     def __init__(self, db_list, master_node_count=1, partitions=1, replicas=0,
                  db_user='neo', db_password='neo',
                  db_super_user=DB_ADMIN, db_super_password=DB_PASSWD,
-                 cleanup_on_delete=False, temp_dir=None,
-                 clear_databases=True, adapter='MySQL',
+                 cleanup_on_delete=False, temp_dir=None, clear_databases=True,
+                 adapter=os.getenv('NEO_TESTS_ADAPTER', 'MySQL'),
                  verbose=True,
                  address_type=ADDRESS_TYPE,
         ):