More ubuntu fixes for install guide

This patch contains fixes based on testing the install guide
for ubuntu.

The following chapters have been confirmed under Ubuntu

2 Basic Operating System Configuration
3 Configuring Identity Service
4 Configuring Image Service
6. Adding a dashboard

Currently testing:
5 Configuring the Compute Services

The following sections are verified OK:
Installing the Nova Controller Services.

It cannot verify the full chapter as the networking section
does not exist.

Change-Id: I6d1f1ae7e1ef78b56be3481c5a17ebed883cb7f1
Merge "More ubuntu fixes for install guide"