Validation for volumes parameters as string in _container_config

Author: yograterol

docker/client.py

@@ -158,6 +158,9 @@ def _container_config(self, image, command, hostname=None, user=None,
                 exposed_ports['{0}/{1}'.format(port, proto)] = {}
             ports = exposed_ports
 
+        if isinstance(volumes, (str, unicode)):
+            volumes = [volumes, ]
+
         if isinstance(volumes, list):
             volumes_dict = {}
             for vol in volumes: