use the rootfs mount point for the tty's
use the rootfs mount point for the tty's

The rootfs is always located in rootfs->mount, let's use it for
the tty.

Signed-off-by: Daniel Lezcano <3211518dd4d87cb3f7ee12cb52e14b7fb2bc0446@fr.ibm.com>

DarknessBeforeDawn/lxc,cjwatson/lxc,abstrakraft/lxc-android-lxc,Ponce/lxc,JohnPeacockMessageSystems/lxc,ojkastl/lxc_Patches,christiaan/lxc,ecarrara/lxc,aeris/lxc,glensc/lxc,smoser/lxc,virajs/lxc,szaszg/lxc,Distrotech/lxc,federicobriata/lxc,hkjolhede/lxc,LynxChaus/lxc,smoser/lxc,terceiro/lxc,weizhenwei/lxc,armcc/lxc,Pelagicore/lxc,caglar10ur/lxc,jirislaby/lxc,yubo/lxc,sapun/lxc,usc-isi/lxc,hallyn/lxc,federicobriata/lxc,akshaykarle/lxc,lisongmin/lxc,Ponce/lxc,rowhit/lxc,JohnPeacockMessageSystems/lxc,ioops/lxc,Distrotech/lxc,bmoar/lxc,lisongmin/lxc,Ponce/lxc,ojkastl/lxc_Patches,regit/lxc,lazy404/lxc,christiaan/lxc,sapun/lxc,ss1h2a3tw/lxc,raspberrypython/lxc,terceiro/lxc,codebauss/lxc,jirislaby/lxc,glensc/lxc,rldleblanc/lxc,szaszg/lxc,hallyn/lxc,tych0/lxc,bostjan/lxc,ksperis/lxc,major/lxc,Pelagicore/lxc,szaszg/lxc,codebauss/lxc,abstrakraft/lxc-android-lxc,federicobriata/lxc,smoser/lxc,hfuCN/lxc,fwilson42/lxc,cjwatson/lxc,rowhit/lxc,LynxChaus/lxc,yubo/lxc,akshaykarle/lxc,efiop/lxc,aeris/lxc,GreatFruitOmsk/lxc,hfuCN/lxc,bmoar/lxc,LynxChaus/lxc,sapun/lxc,lisongmin/lxc,GreatFruitOmsk/lxc,ss1h2a3tw/lxc,weizhenwei/lxc,JohnPeacockMessageSystems/lxc,ojkastl/lxc_Patches,hkjolhede/lxc,ecarrara/lxc,caglar10ur/lxc,akshaykarle/lxc,QingweiPeterLan/cs188-lxc,weizhenwei/lxc,potatosalad/lxc,QingweiPeterLan/cs188-lxc,efiop/lxc,inokappa/lxc,ss1h2a3tw/lxc,ysbnim/lxc,smoser/lxc,glensc/lxc,ostap/lxc,regit/lxc,aeris/lxc,virajs/lxc,inokappa/lxc,fwilson42/lxc,rowhit/lxc,ostap/lxc,hfuCN/lxc,ksperis/lxc,tych0/lxc,usc-isi/lxc,ojkastl/lxc_Patches,jirislaby/lxc,terceiro/lxc,kylef/lxc,abstrakraft/lxc-android-lxc,DarknessBeforeDawn/lxc,caglar10ur/lxc,christiaan/lxc,thmo/lxc,efiop/lxc,rldleblanc/lxc,coconutpilot/lxc-gentoo-new,codebauss/lxc,regit/lxc,armcc/lxc,rldleblanc/lxc,virajs/lxc,ecarrara/lxc,usc-isi/lxc,coconutpilot/lxc-gentoo-new,hallyn/lxc,lazy404/lxc,potatosalad/lxc,fwilson42/lxc,GreatFruitOmsk/lxc,Pelagicore/lxc,QingweiPeterLan/cs188-lxc,ysbnim/lxc,thmo/lxc,DarknessBeforeDawn/lxc,hkjolhede/lxc,Distrotech/lxc,major/lxc,ioops/lxc,raspberrypython/lxc,bostjan/lxc,raspberrypython/lxc,tych0/lxc,abstrakraft/lxc-android-lxc,ioops/lxc,ksperis/lxc,bostjan/lxc,major/lxc,ysbnim/lxc,cjwatson/lxc,yubo/lxc,kylef/lxc,armcc/lxc,lazy404/lxc,thmo/lxc,bmoar/lxc