Fix API break on bdev_specs
Fix API break on bdev_specs

Signed-off-by: Laurent Barbe <f1b010126f61b5c59e7d5eb42c5c68f6105c5914@ksperis.com>

aeris/lxc,ysbnim/lxc,LynxChaus/lxc,federicobriata/lxc,GreatFruitOmsk/lxc,Distrotech/lxc,thmo/lxc,cjwatson/lxc,hfuCN/lxc,caglar10ur/lxc,federicobriata/lxc,armcc/lxc,cjwatson/lxc,ysbnim/lxc,akshaykarle/lxc,armcc/lxc,cjwatson/lxc,hfuCN/lxc,LynxChaus/lxc,hfuCN/lxc,ss1h2a3tw/lxc,GreatFruitOmsk/lxc,akshaykarle/lxc,terceiro/lxc,terceiro/lxc,tych0/lxc,hallyn/lxc,LynxChaus/lxc,bostjan/lxc,GreatFruitOmsk/lxc,hallyn/lxc,aeris/lxc,caglar10ur/lxc,QingweiPeterLan/cs188-lxc,thmo/lxc,Distrotech/lxc,QingweiPeterLan/cs188-lxc,ss1h2a3tw/lxc,armcc/lxc,terceiro/lxc,Distrotech/lxc,tych0/lxc,ksperis/lxc,bostjan/lxc,tych0/lxc,ss1h2a3tw/lxc,federicobriata/lxc,ksperis/lxc,ksperis/lxc,bostjan/lxc,aeris/lxc,hallyn/lxc,caglar10ur/lxc,ysbnim/lxc,QingweiPeterLan/cs188-lxc,thmo/lxc,akshaykarle/lxc