Increase staggered get delay

A stagger delay of 5 ms appears to be insufficient under heavy load, as more than 50% of the remote gets end up requesting the value from both owners.

We have made some experiments with delays of 100ms and 5000ms, and while they're both vastly better than 5ms, the difference between seems to be very small. So we have decided to remove the system property and use remote-timeout / 10 (1500ms with the default configuration) as the stagger timeout instead.