[Bug] Errors in plugins leave zenohd in a stalled state

[OlivierHecart]

Describe the bug

When errors occur in plugins, zenohd does not exit but does not work any more and seems to be in a stalled state.

To reproduce

1. Run zenohd with rest plugin:

./zenohd 

2. Run a second zenohd with the rest plugin on different zenoh port but same http port:

./zenohd -l tcp/[::]:7448

The second zenohd reports an error running the rest plugin but keeps running and is not reachable by clients on port 7448.

System info

• Platform: macOS M2
• Zenoh version 0.7.2-rc

[Mallets]

@milyin is this issue still relevant or #583 solved it?