adding card026 network node overview

adding a short snippet on network node structure

Change-Id: Iceb22774d969fb1bea7917df2f77270d873f6ffd
Implements: bp/training-manuals
Merge "adding card026 network node overview"
adding card044 - nuetron in the network node

added neutron config card, and ordering cleanup in the chapter3
file

Change-Id: I87e0d2aa9d42c4850e7f7d62674019c95bf7208c
Implements: bp/training-manuals
cleaning up order of sections

Some of the cards had gotten added out of order. cleaning it up
before it got really bad.

Change-Id: I0496a22104cb50ff6be0533e7459da1bf205473e
Implements: bp/training-manuals
adding card 45 configuring virutal networking

added l3 confifuration sections and openrc section.
two distinct section items pulled from source files.

Change-Id: I835017faacec12cb532a478b29ffa821aea31354
Implements: bp/training-manuals
fixing card naming and reference

Change-Id: I7da1ab3c06d41e9fcab30ca7670640bd52571b0d
Implements: bp/training-manuals