Support -timestamp and -tshort options for tc monitor like ip monitor.

# tc -tshort monitor
[2015-09-23T16:39:11.260555] qdisc fq 8003: dev eth0 root refcnt 2 limit
10000p flow_limit 100p buckets 1024 quantum 3028 initial_quantum 15140
refill_delay 40.0ms
Signed-off-by: Eric Dumazet <edumazet@google.com>