lxc-debian: added support for package installation
lxc-debian: added support for package installation

- added --mirror, --security-mirror and --package parameters
- generate source.list
- install packages into final lxc instance

Signed-off-by: Alexander Dreweke <e46fc836cca3acec03944314d1457c2ae6c68ef3@dreweke.net>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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