Import Socket::Option specs from rubysl-socket

[etehtsea]

This specs are originally authored by @yorickpeterse and licensed by BSD
license.

[eregon]

@etehtsea @yorickpeterse ruby/spec is licensed as MIT, do you agree to re-license those specs with the MIT license?

[yorickpeterse]

@eregon The specs are licensed under the BSD license. Including the BSD license somewhere should suffice.

[etehtsea]

@eregon @yorickpeterse @eregon I added license inside each spec file.

[etehtsea]

I've found that there was option specs.
cc39ba5
9709120

So another option could be to resurrect them and make uptodate.
Third option is to simply rewrite Socket::Option specs from scratch.

[eregon]

@etehtsea Thanks for the investigation!
The license per header seems a good option.
I'll have a look tomorrow, not sure why those specs disappeared since I thought I kept the files removed by that commit, maybe something missed in the merge.

[eregon]

@etehtsea So indeed a few specs were lost, I added them back in f305537.
The specs look very similar, but it would be good to add the missing parts in the existing ones.
I'll look at that tomorrow.

[etehtsea]

@eregon good, thanks!

[headius]

@yorickpeterse The original socket specs, under the rubyspec project, were not licensed BSD. I believe they were MIT licensed. I know you have added a lot and cleaned up many specs. Did you rewrite all of them from scratch?

If you did your additions and modifications atop the older rubyspec code, I have to also ask: did you contact everyone who contributed to those specs and get their permission to relicense as BSD?

[headius]

A bit of clarification... I believe MIT is permissive enough that you can add BSD, but I don't think you can remove MIT without getting permission from all former contributors.

[yorickpeterse]

@headius As far as I can remember I re-wrote all specs from scratch.