adds more material to operator network node
adds more material to operator network node

includes three new chapters to the operator network node

implements blueprint training-manuals

Change-Id: Ic4471166c5c4de0b22551a94af8e7eebf1721a04

harrisonfeng/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,Nabs007/training-guides,openstack/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,openstack/training-guides