KH hangs in a scenario if test machine time is changed.

[yuvarajgogoi]

Steps to reproduce

1. Start a client.
2. change the test machine time to some 2 years earlier.
3. Check KH

KH hangs.

Tested in Debian and is always reproducible.

[dnotestein]

Fixed in cryptonomex/fc@f791cba

[yuvarajgogoi]

Still reproducible