Update to use apache-libcloud 0.15.1
Update to use apache-libcloud 0.15.1

Update the import-aws module to be able to use the latest version of apache-libcloud (0.15.1 as of this commit).
- Update instance variables for Node to match latest version
- Append Node.id to Node.name in order to generate unique host names

pombredanne/mod-import-aws,kater169/mod-import-aws,shinken-debian-modules/shinken-mod-import-aws,shinken-monitoring/mod-import-aws