Add 'config' option to lxc-archlinux template and fix getopt string
Add 'config' option to lxc-archlinux template and fix getopt string

This option allows user to control installation repository and options
using alternative pacman configuration file.
Also remove unnecessary sed invocation during container configuration.

Signed-off-by: Alexander Vladimirov <fcfcfafcfa76268e5650f0cf5fb907a2ae17357e@gmail.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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