utils: close parent end in child process after fork
utils: close parent end in child process after fork

Signed-off-by: Long Wang <aff024fe4ab0fece4091de044c58c9ae4233383a@laoqinren.net>

ss1h2a3tw/lxc,caglar10ur/lxc,thmo/lxc,federicobriata/lxc,LynxChaus/lxc,hallyn/lxc,federicobriata/lxc,hallyn/lxc,caglar10ur/lxc,terceiro/lxc,ss1h2a3tw/lxc,LynxChaus/lxc,aeris/lxc,terceiro/lxc,ss1h2a3tw/lxc,aeris/lxc,aeris/lxc,thmo/lxc,LynxChaus/lxc,caglar10ur/lxc,federicobriata/lxc,terceiro/lxc,hallyn/lxc,thmo/lxc