Reload godnscollector filters using SIGHUP

[arvchristos]

Currently, when new IOCs are introduced from MISP, we are restarting the godnscollector process as it can be seen here:

https://github.com/CERN-CERT/pDNSSOC/blob/main/files/configuration/supervisor/supervisord.conf#L25

I initially proposed a new functionality to reload filters with SIGHUP for go-dnscollector here:

dmachard/go-dnscollector#375

Given that this is now introduced in go-dnscollector, we should test the new functionality and just send a signal instead of restarting the process.