Properly format markdown in README.md
Properly format markdown in README.md

Mark code blocks and list items as such. Also use preformated text for
commands or flags and wrap long lines.

Change-Id: I6992abb1e1f18fba62adc127285d75f3f39659db

invenfantasy/kolla,chenzhiwei/kolla,coolsvap/kolla,rahulunair/kolla,fdumpling/kolla,thetrav/kolla,fdumpling/kolla,coolsvap/kolla,openstack/kolla,tonyli71/kolla,rajalokan/kolla,chenzhiwei/kolla,negronjl/kolla,jakedahn/kolla,brk3/kolla,stackforge/kolla,dardelean/kolla-ansible,invenfantasy/kolla,intel-onp/kolla,GalenMa/kolla,limamauricio/mykolla,mandre/kolla,LoHChina/kolla,toby82/kolla,limamauricio/mykolla,chenzhiwei/kolla,thetrav/kolla,dardelean/kolla-ansible,mrangana/kolla,brk3/kolla,stackforge/kolla,HackToday/kolla,fdumpling/kolla,bdastur/kolla,nihilifer/kolla,GalenMa/kolla,rajalokan/kolla,coolsvap/kolla,stackforge/kolla,openstack/kolla,tonyli71/kolla,jasonbrooks/kolla,mandre/kolla,LoHChina/kolla,negronjl/kolla,toby82/kolla,limamauricio/mykolla,jakedahn/kolla,mandre/kolla,mrangana/kolla,nihilifer/kolla,negronjl/kolla,toby82/kolla,intel-onp/kolla,rahulunair/kolla,jakedahn/kolla,rajalokan/kolla,HackToday/kolla,meticulo3366/kolla,HackToday/kolla,meticulo3366/kolla,dardelean/kolla-ansible,bdastur/kolla,invenfantasy/kolla,jasonbrooks/kolla,LoHChina/kolla