dhcp: Filtering unknown 'reuse_lease-'entries from dhcp

Hi,

currently we're using 'logwatch 7.5.4' on IPFire firewall systems.

Considering the 'dhcp' entries, we're receiving bug reports about
logwatch logs containing unknown messages like this:

[IPFire Bug List /
#12242](https://bugzilla.ipfire.org/show_bug.cgi?id=12242):

    Unknown Entries:
    reuse_lease: lease age 0 (secs) under 25% threshold, reply with
    unaltered, existing lease for 10.0.0.21: 1 Time(s)
    reuse_lease: lease age 3 (secs) under 25% threshold, reply with
    unaltered, existing lease for 10.0.0.27: 1 Time(s)

Comment in https://community.ipfire.org/t/dhcp-server-unknown-entries/211:
"This seems to be the case while the dhcp server logs if a client asks
too early for a still existing lease. There is usally nothing wrong with
the network."

Could this be fixed by altering 'logwatch-7.5.4\scripts\services\dhcpd'?

Best,
Matthias Fischer