[PATCH]Add lacked syscall.unshare to tapset

[Zhaolei]

Hello, Mark

>> It is different from flags in __fork_flags.
>> I think it maybe necessary to add a new function like __unshare_flags in
>> aux_syscalls.stp.
> 
> If I read that fragment above correctly then not all the same flags are
> supported, but you can still call unshare with them. The result will
> just be that the syscall fails (because it doesn't support that
> particular flag). So I don't think you need new function.
I checked the difference between __fork_flags and sys_unshare.
Nearly all unshare flags are supported by __fork_flags except CLONE_NEWUTS
and CLONE_NEWNET. They should be __fork_flags too.

What if I add CLONE_NEWUTS and CLONE_NEWNET into __fork_flags function and
use __fork_flags in probe syscall.unshare?

Best Regards
Zhaolei