Add evacuate instances to Cloud Admin Guide
Clarify that evacuate method is preferred over manual for node recovery
Edit broken and obsolete external guide references
Remove gerunds in related files
Address request for stylistic edits from review
Address linking issues from review

Change-Id: Iccf188ad89a8cc277966cb9c0a530ba24613127b
Closes-Bug:#1222735
Adding card047 Installing Nova Compute

Installing nova to the compute node. Adding install guide to
the compute section.

Change-Id: I1f34053479ca7ebf9b9adb46cec414aefae6addc
Implements: bp/training-manuals
added card043 installing and configuring OVS in the network node

added ovs card, specifying specific specific OVS section

Change-Id: I60d778c7ec34f15684f6f7c6932912aee722a1f4
Implements: bp/training-manuals
adding card007 Core Project Overview

adding Core Overview for the start of the book

Change-Id: Ibc60c1abdf727b622865950a7a45d42c8c6753a0
Implements: bp/training-manuals