Fix an issue with double encoding the container name in the CloudFiles
driver upload_object method.

Also properly encode container and object name used in the HTTP request
in the get_container and get_object method. For clarity rename current
 _clean* methods to _encode*.

Fixes LIBCLOUD-328.


git-svn-id: https://svn.apache.org/repos/asf/libcloud/trunk@1485839 13f79535-47bb-0310-9956-ffa450edef68