lxc-ps: fix order of output and fix --lxc opt
lxc-ps: fix order of output and fix --lxc opt

We must output the lines from 'ps' in same order for tree views.

Fix also --lxc option to only show processes from containers.

Signed-off-by: Natanael Copa <d6dfbe96822fc6f407d114112670f8d1571509f1@alpinelinux.org>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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