Proposal: New max_fail parameter for easier and more powerful allowing some hosts to fail

Hi,

As documented in https://github.com/ansible/proposals/blob/master/proposals_process_proposal.md I would like to let you know that I have described a proposal like in this email subject here: https://github.com/ansible/proposals/issues/133

Please let me know (in the issue) if you think that this idea makes sense to you. If so, then I will try to make a PR for it.

Thanks,
Greg Dubicki