user ',' as event separator in eventdef

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
update scripts/io/kprobes-do-sys-open.kp

This sample script demostrate how to access function arguments
using kprobe.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
update comments in some sample scripts

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
add ktap boot time accounting

In my box, it booted in ~4ms.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
update Copyright info

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>