Add posibility to restart workers immediately after TTL will expire

[zwirek]

Hi,
I've noticed that when ttl is set and expired then all workers are restarted in the same time. This causes bigger lag with response from ppm. It is bigger problem when bootstrap of application is heavy.

My proposal is to add another strategy to handle workers restart when ttl will expire. Workers will be restarted immediately after ttl will expire +/-5 sec. This should keep workers fresh and should prevent workers from restarting at the same time.

To enable this behavior ttl-restart-strategy cli parameter or config parameter need to be set on expire. By default ppm will restart workers due to ttl expiration only when request will be received. As it is handled in current implementation.

[andig]

I think we should do this without an additional parameter. The jitter definitely makes sense.

[zwirek]

I've amended the code as you suggested. I've removed additional parameter and now workers will be restarted as soon as possible when ttl expire

[andig]

Would appreciate a PR review.