Fix get_config_item for sys:mixed
Fix get_config_item for sys:mixed

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>
Acked-by: Serge E. Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

rldleblanc/lxc,hallyn/lxc,lazy404/lxc,raspberrypython/lxc,akshaykarle/lxc,christiaan/lxc,szaszg/lxc,Pelagicore/lxc,cjwatson/lxc,Pelagicore/lxc,lisongmin/lxc,fwilson42/lxc,Ponce/lxc,armcc/lxc,jirislaby/lxc,QingweiPeterLan/cs188-lxc,terceiro/lxc,efiop/lxc,ecarrara/lxc,sapun/lxc,Distrotech/lxc,thmo/lxc,rowhit/lxc,rldleblanc/lxc,lisongmin/lxc,bostjan/lxc,ioops/lxc,JohnPeacockMessageSystems/lxc,hallyn/lxc,bostjan/lxc,christiaan/lxc,lisongmin/lxc,hfuCN/lxc,major/lxc,codebauss/lxc,DarknessBeforeDawn/lxc,virajs/lxc,thmo/lxc,Ponce/lxc,QingweiPeterLan/cs188-lxc,bmoar/lxc,raspberrypython/lxc,Distrotech/lxc,bmoar/lxc,Pelagicore/lxc,armcc/lxc,ecarrara/lxc,ioops/lxc,akshaykarle/lxc,ss1h2a3tw/lxc,yubo/lxc,christiaan/lxc,DarknessBeforeDawn/lxc,virajs/lxc,thmo/lxc,hkjolhede/lxc,QingweiPeterLan/cs188-lxc,hfuCN/lxc,ss1h2a3tw/lxc,ksperis/lxc,sapun/lxc,JohnPeacockMessageSystems/lxc,tych0/lxc,aeris/lxc,codebauss/lxc,bostjan/lxc,hkjolhede/lxc,sapun/lxc,ss1h2a3tw/lxc,virajs/lxc,codebauss/lxc,akshaykarle/lxc,armcc/lxc,caglar10ur/lxc,ysbnim/lxc,ecarrara/lxc,ysbnim/lxc,Ponce/lxc,federicobriata/lxc,lazy404/lxc,jirislaby/lxc,hfuCN/lxc,ksperis/lxc,efiop/lxc,tych0/lxc,terceiro/lxc,aeris/lxc,aeris/lxc,major/lxc,LynxChaus/lxc,yubo/lxc,ioops/lxc,bmoar/lxc,hkjolhede/lxc,terceiro/lxc,GreatFruitOmsk/lxc,fwilson42/lxc,federicobriata/lxc,JohnPeacockMessageSystems/lxc,rldleblanc/lxc,caglar10ur/lxc,jirislaby/lxc,DarknessBeforeDawn/lxc,efiop/lxc,LynxChaus/lxc,rowhit/lxc,GreatFruitOmsk/lxc,hallyn/lxc,major/lxc,ysbnim/lxc,rowhit/lxc,lazy404/lxc,caglar10ur/lxc,szaszg/lxc,szaszg/lxc,yubo/lxc,federicobriata/lxc,tych0/lxc,ksperis/lxc,GreatFruitOmsk/lxc,cjwatson/lxc,fwilson42/lxc,Distrotech/lxc,LynxChaus/lxc,cjwatson/lxc,raspberrypython/lxc