triton rbac role[s] should support new role API

[arekinath]

In CloudAPI we rev'd to accept-version: 9.0.0 in order to change the RBAC role endpoints to take lists of objects for policy and members instead of strings. This enables us to create cross-account role membership (by adding a member that looks like {'type': 'account', 'login': 'foobar'}) and be less loosy goosy with whether things are a UUID or login name. It also takes away the separate default_members array and replaces it with {'default':true/false} on each of the members objects.

It would be useful to use this new API to make the interface for roles a little less daunting and allow the use of the new features.

https://apidocs.joyent.com/cloudapi/#roles is the docs on the new object format and the fields on them

[trentm]

This is in and published in triton@7.5.0. Thanks!