Some states are complicated and multiple subparts,
or maybe cross-call into __states__ if they manage subresources.
In these cases, they will have multiple comments.
Make this more ergonomic by supporting a list of strings as the
value for ret['comment'] in state returns and documenting this.
By joining comments on newlines, it is possible to combine
single-line and multi-line comments cleanly, as opposed to e.g. commas.
The driving impetus for this is some of the boto modules.
An update to the boto_sqs module is included as an example.
Add a check that outgoing state return data has the right shape,
and add a testcase as well.
Fix the NPM state tests and the saltmod runner & wheel state functions
to comply with the prescribed format.
