Reduce logging for readiness check/clamd

[maltekrupa]

Hi,

thanks for this project!

I'm running this container on multiple clusters with multiple replicas and the following messages are filling the logs quite fast:

Tue Mar 24 14:26:17 2020 -> /eicar.com: Win.Test.EICAR_HDB-1 FOUND
Tue Mar 24 14:26:17 2020 -> ~/eicar.com: Win.Test.EICAR_HDB-1 FOUND

They appear whenever the readyness.sh script is called which is expected I guess.
I tried to disable the logs on a running container by altering the /etc/clamav/clamd.conf and sending SIGHUPs to clamd but so far without success.

I'd like to know if you can think of a way to make the clamd logs either optional or disable them completely.

If we find a solution, I'd be happy to send in a PR.

Thanks!