wg: Flush v4 routes for v6 randomized test to reduce the test time

The validation method uses a simple list to store all the routes in a
sorted way so that it can be looked up and verify the lookup

wg: Flush v4 routes for v6 randomized test to reduce the test time

The validation method uses a simple list to store all the routes in a
sorted way so that it can be looked up and verify the lookup results
of the radix tree. The list method can be really slow when there are
many routes, so the randomized test can take ~80 minutes on my test box.
Separate the v4 and v6 tests to significantly reduce the test time (e.g.,
from ~80 minutes to ~15 minutes).

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wg: Refactor selftest allowedips.c

- Refactor multiple functions and macros to make the implementation read
better.
- Fix some memory free issues upon errors; e.g., kfree() panics if the
given p

wg: Refactor selftest allowedips.c

- Refactor multiple functions and macros to make the implementation read
better.
- Fix some memory free issues upon errors; e.g., kfree() panics if the
given pointer is NULL.
- Add progress reports for the randomized test as it can take really
long time (e.g., ~80 minutes on my test box).
- Various improvements and style cleanups.

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wg: Port selftest allowedips.c

wg: Import selftest code from wireguard-freebsd

URL: https://git.zx2c4.com/wireguard-freebsd/
Files:
- src/selftest/allowedips.c
- src/selftest/cookie.c
- src/selftest/counter.c