Only bits 1 and 2 are used in the DHCP overload option, so when we encounter the option set the last bit as well to ensure servername and bootfile are only checked once as their check unsets bits 1 and 2.
Only bits 1 and 2 are used in the DHCP overload option, so when we encounter
the option set the last bit as well to ensure servername and bootfile are
only checked once as their check unsets bits 1 and 2.

Thanks to Tobias Stoeckmann.
rsmarples/dhcpcd,rsmarples/dhcpcd,rsmarples/dhcpcd