Update rootfs README
Update rootfs README

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

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