Update Gandi compute driver to handle new billing model.

Contributed by Aymeric Barantal, part of LIBCLOUD-317.


git-svn-id: https://svn.apache.org/repos/asf/libcloud/trunk@1488483 13f79535-47bb-0310-9956-ffa450edef68
Fix a bug in the Linode driver and remove extra newline which is added
when generating a random root password in create_node.

Contributed by Juan Carlos Moreno, part of LIBCLOUD-334.


git-svn-id: https://svn.apache.org/repos/asf/libcloud/trunk@1489200 13f79535-47bb-0310-9956-ffa450edef68