lxc-execute: find lxc-init
lxc-execute: find lxc-init

lxc-init used to be under /usr/lib/lxc.  Now it is under
/usr/lib/<multiarch>/lxc, but old containers will still have it under
/usr/lib/lxc.  So search for a valid lxc-init to run.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>
Signed-off-by: Daniel Lezcano <3211518dd4d87cb3f7ee12cb52e14b7fb2bc0446@fr.ibm.com>

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