Hosts that migrate from one network to another could request their
old IP address which might be already in use by another statically
configured host. Currently non-authoritative dnsmasq servers will
ignore such requests, but ISC DHCP client will send discovery packets
next carrying the same
Reload configuration from dynamic configuration files when they're
modified, but not before flushing old configuration loaded from the
same place.This behavioral change affects options --dhcp-hostsdir,
--dhcp-optsdir and --hostsdir.
Discard DHCPv6 options on SIGHUP before reloading them from
