Downgrade "verification failed" message from verbose to debug2
Downgrade "verification failed" message from verbose to debug2

This message will be printed for every packet in severe reordering situtations,
so better not print it by default.

In the future, we'll need a rate limiting mechanism...

rlei/fastd-android,rlei/fastd-android,rlei/fastd-android,rlei/fastd-android,rlei/fastd-android