tc: fix bugs for tcp_flags and ip_attr hex output

tc: fix bugs for tcp_flags and ip_attr hex output

Fix hex output for both the ip_attr and tcp_flags print functions.

Sample usage:

$ $TC qdisc add dev lo ingress
$ $TC filter add dev lo parent ffff: prio 3 proto ip flower ip_tos 0x8/32
$ $TC fitler add dev lo parent ffff: prio 5 proto ip flower ip_proto tcp \
	tcp_flags 0x909/f00

$ $TC filter show dev lo parent ffff:

filter protocol ip pref 3 flower chain 0
filter protocol ip pref 3 flower chain 0 handle 0x1
  eth_type ipv4
  ip_tos 0x8/32
  not_in_hw
filter protocol ip pref 5 flower chain 0
filter protocol ip pref 5 flower chain 0 handle 0x1
  eth_type ipv4
  ip_proto tcp
  tcp_flags 0x909/f00
  not_in_hw

$ $TC -j filter show dev lo parent ffff:

[{
    "protocol":"ip",
    "pref":3,
    "kind":"flower",
    "chain":0
},{
    "protocol":"ip",
    "pref":3,
    "kind":"flower",
    "chain":0,
    "options": {
	"handle":1,
	"keys": {
	    "eth_type":"ipv4",
	    "ip_tos":"0x8/32"
    },
    "not_in_hw":true
    }
},{
    "protocol":"ip",
    "pref":5,
    "kind":"flower",
    "chain":0
},{
    "protocol":"ip",
    "pref":5,
    "kind":"flower",
    "chain":0,
    "options": {
	"handle":1,
	"keys": {
	    "eth_type":"ipv4",
	    "ip_proto":"tcp",
	    "tcp_flags":"0x909/f00"
	},
	"not_in_hw":true
    }
}]

Signed-off-by: Keara Leibovitz <kleib@mojatatu.com>
Signed-off-by: David Ahern <dsahern@gmail.com>