T1255: read in modifications from third party scripts before altering /etc/hosts
T1255: read in modifications from third party scripts before altering /etc/hosts

E.g. DHCP server can update /etc/hosts with somw mappings - those mappings
were lost on any subsequent invocation of host_name.py

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x