[Node] fix process bot restart issues

[GuillaumeDSM]

there was 2 issues:

1. we need to handle process octobot restarts (ex: when changing config) => this changes pid, node has to bind to the new pid and not start a duplicate process (also needs a grace period to handle the few secs when bot is starting and did not yet update its state file)
2. when master is stopped, it stops child processes, when it's restarted, we want to instantly restart the child without waiting for any grace period (child is not "late", it's just hasnt been respawned yet)

[Herklos]

😮

[GuillaumeDSM]

oups

[Herklos]

👍