Fix postgres tests

- take postgres superuser from user iff it is not in config

frappe/database/postgres/setup_db.py

@@ -35,6 +35,9 @@ def setup_help_database(help_db_name):
 def get_root_connection(root_login=None, root_password=None):
 	import getpass
 	if not frappe.local.flags.root_connection:
+		if not root_login:
+			root_login = frappe.conf.get("root_login") or None
+
 		if not root_login:
 			root_login = input("Enter postgres super user: ")
 

test_sites/test_site_postgres/site_config.json

@@ -7,6 +7,7 @@
  "mail_login": "test@example.com",
  "mail_password": "test",
  "admin_password": "admin",
+ "root_login": "postgres",
  "root_password": "travis",
  "run_selenium_tests": 1,
  "host_name": "http://test_site_postgres:8000"