lxc-ps: support '-n name' and '-- ps-options'
lxc-ps: support '-n name' and '-- ps-options'

This is more consistent with other lxc commands

Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/820720

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

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