Support for "doas" become_method

[napkindrawing]

Howdy!

I've hacked up a first-pass at basic support for the doas become_method, which is working for me on FreeBSD.

I haven't added any unit tests yet, as I'm not familiar with how the tests are laid out here.

Cheers,
Mike

[dw]

Champion! The structure of the connection plug-ins will drastically change for asynchronous connect when that arrives, so right now what you have is perfect -- a little cutpaste it's all I've been doing too :P

Eventually these will be converted to a small set of state machine classes, and the most important thing to capture are the expected strings and general behaviour.

I need to write better stub test implementations for a bunch of stuff, including su, so I will add doas to the list.

Also the "mitogen" Travis jobs are failing right now due to the child process reaping issue -- don't worry about those either.

[napkindrawing]

Glorious!

Thanks so much again for all your work with mitogen. It's such an exciting piece of software on it's own, and I still can't believe what a huge impact it will have on ansible 🎉

[dw]

Thanks for the PR! It's on master now, I hope to cut another release in the coming week once a few more tickets are closed