Splitting up 2FA specs

[janko]

When I'm making changes to 2FA or trying to understand how something works, I find it a bit difficult to navigate spec/two_factor_spec.rb due to its size. 2FA methods are often mixed, so if I want to find only specs for e.g. otp feature, I need to dig a bit.

I would like to take a stab at splitting it up, but before that I wanted to check if such a change would be accepted. Of course, we would still retain integration tests between various 2FA methods.

[jeremyevans]

I think it is fine to split off specs that use only one of the two factor features to a separate spec file for that feature. It's probably best to keep the specs that use multiple two factor features in two_factor_spec.rb.