Edits for consistency

Partial-Bug: #1250515

author: diane fleming

Change-Id: Id8f48b14e7bc9119c7261ff0c6c4f63f25498880
backport: none
Moves note about Ubuntu 12.04 LTS with GRE

Change-Id: Iab4fd385ee19aef96be51580f4efa8df44259976
Closes-bug: 1251714
Edit Manage Images section in User Guide

Adds options to update disk_bus and cdrom_bus metadata properties based on the configured hypervisor type

Change-Id: I11ca56450dfbf4e51a2908206f7d6c664c83fd9b
author: nermina miller
backport: havana
Closes-Bug: #1106421
Merge "Moves note about Ubuntu 12.04 LTS with GRE"
Merge "Edit Manage Images section in User Guide"
Merge "Edits for consistency"
front end restructure of training guides

cleaned up first book with preface, getting started/under construction, and added common community support page. this is part of the overall restructure effort.

implements bp/training-manuals

Change-Id: I5c848a708998ceb1af88371d31adfa0f52f41a8d