conpaas manifest guide: 'Application' is a required field


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5251 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
conpaas: add cpsdirector.manifest.get_manifest_class


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5252 ef35cc4a-2640-4bbf-98bc-65920db7d8ae