Manage tombstone lifespan.
Manage tombstone lifespan.

We don't want to keep them forever or we build up state
forever. This will remove them after a timeout window.
The result is that anyone partitioned from the cluster
for more than TOMBSTONE_LIFESPAN and believing that a
service is alive will re-add it to the cluster.

Need to add functionality to flush state when hosts
leave the cluster.

newrelic/sidecar,relistan/sidecar,Nitro/sidecar,benoahriz/sidecar,Nitro/sidecar,relistan/sidecar,newrelic/sidecar,Nitro/sidecar,benoahriz/sidecar,relistan/sidecar,benoahriz/sidecar,newrelic/sidecar,newrelic/sidecar,Nitro/sidecar,benoahriz/sidecar