closes bpo-37405: Make socket.getsockname() always return a tuple for AF_CAN. (GH-14392) (GH-16018)

This fixes a regression from 3.5. In recent releases, `getsockname()` in the AF_CAN case has returned a string.
(cherry picked from commit 954900a3f98a8c0dea14dd575490237f3f8626b3)

Co-authored-by: bggardner <brent@ebrent.net>
3 files changed