iprule: support for ip_proto, sport and dport match options

iprule: support for ip_proto, sport and dport match options

add support to match on ip_proto, sport and dport ranges.
For ip_proto, this patch currently enumerates, tcp, udp and sctp.
This list can be extended in the future.

example:
$ip rule add sport 666-777 dport 999 ip_proto tcp table 100
$ip rule show
0:      from all lookup local
32765:  from all ip_proto 6 sport 666-777 dport 999 lookup 100
32766:  from all lookup main
32767:  from all lookup default

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David Ahern <dsahern@gmail.com>