fix busybox template
fix busybox template

Fix various bug with the busybox template:
 * add a warning when busybox is not statically linked
 * delete the password for root (chpasswd is not available for all busybox)
 * add the new pts option

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

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