WARNING ABOUT leasefail SCRIPT IN ZEROCONF-ENABLED CONFIGURATIONS

if your UDHCP compilation flags are set to support Zeroconf, and
you change the default script behaviour or attributing the link-local
address to the :0 alias, should not do any network configuration 
in 'leasefail' script, since it would damage the configurations 
that 'zeroconf' script may have done just before 'leasefail' is run.

