c/r: log the exact command we exec
c/r: log the exact command we exec

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

QingweiPeterLan/cs188-lxc,ss1h2a3tw/lxc,cjwatson/lxc,hfuCN/lxc,ss1h2a3tw/lxc,LynxChaus/lxc,caglar10ur/lxc,ysbnim/lxc,hallyn/lxc,terceiro/lxc,thmo/lxc,akshaykarle/lxc,cjwatson/lxc,LynxChaus/lxc,GreatFruitOmsk/lxc,terceiro/lxc,hfuCN/lxc,aeris/lxc,caglar10ur/lxc,federicobriata/lxc,akshaykarle/lxc,ysbnim/lxc,hallyn/lxc,QingweiPeterLan/cs188-lxc,ysbnim/lxc,QingweiPeterLan/cs188-lxc,aeris/lxc,ss1h2a3tw/lxc,akshaykarle/lxc,GreatFruitOmsk/lxc,cjwatson/lxc,caglar10ur/lxc,GreatFruitOmsk/lxc,aeris/lxc,thmo/lxc,LynxChaus/lxc,federicobriata/lxc,terceiro/lxc,federicobriata/lxc,thmo/lxc,hallyn/lxc,hfuCN/lxc