Added test for decrypting success when the first key doesn't match.
Added test for decrypting success when the first key doesn't match.

hashicorp/memberlist,jsternberg/memberlist,42wim/memberlist,atomx/memberlist,oldmantaiter/memberlist,atomx/memberlist,rbg/memberlist,oldmantaiter/memberlist,hashicorp/memberlist,aybabtme/memberlist,42wim/memberlist,jsternberg/memberlist,rbg/memberlist,aybabtme/memberlist