download: Don't use an hardcoded exclude list
download: Don't use an hardcoded exclude list

Instead of hardcoding --exclude=./dev/*, use a new metadata file
"excludes" which lists all the paths or patterns to exclude during
extraction (one per line).

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

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