tests; Don't cause test failures on cleanup errors
tests; Don't cause test failures on cleanup errors

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

thmo/lxc,hfuCN/lxc,cjwatson/lxc,aeris/lxc,thmo/lxc,federicobriata/lxc,ss1h2a3tw/lxc,hallyn/lxc,ss1h2a3tw/lxc,hallyn/lxc,aeris/lxc,caglar10ur/lxc,aeris/lxc,LynxChaus/lxc,terceiro/lxc,cjwatson/lxc,hfuCN/lxc,hallyn/lxc,federicobriata/lxc,LynxChaus/lxc,GreatFruitOmsk/lxc,thmo/lxc,LynxChaus/lxc,cjwatson/lxc,ysbnim/lxc,ysbnim/lxc,caglar10ur/lxc,GreatFruitOmsk/lxc,terceiro/lxc,hfuCN/lxc,terceiro/lxc,caglar10ur/lxc,ysbnim/lxc,federicobriata/lxc,GreatFruitOmsk/lxc,ss1h2a3tw/lxc