Allow custom lostPeerCheckTime

Hi,

We found that when using a remote Redis server, due to latency issues, the default lostPeerCheckTime of 5000 may not be enough. This produces a lot of errors in the logs that have no real meaning.

The suggested change uses the config file to set a custom lostPeerCheckTime. Please let me know if the suggested change is of any interest/use.

Thanks,
Itay Weinberger