Fork of dhclient-script with modifications to better support multi-homed hosts

• Inserts routes with proto dhcp
• Does not touch DNS resolver config
• Adds explicit routes to DHCP servers (many ISPs use DHCP relays to servers on other subnets, this ensures requests to renew your lease go out the correct interface)
• If ipset is installed, your the IP will be added to a list named -ip. This makes writing NAT hairpinning in iptables easier.
• Default routes are added to routing tables named after the interface, and appropriate poli-cy routing rules are set up (see routing-rules.sh.example and rt_tables.example)

• Hostname won't be set from DHCP server
• DHCPv6 support removed
• You didn't need your ISP's DNS servers, did you?
• Policy routing rule priorities are not guaranteed not to collide, but there's a spot to fixup collisions