Added more tests for multiple keys scenarios
Added more tests for multiple keys scenarios

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