Update cinder content for Juno

I updated the cinder content in the installation guide for Juno
as follows:

1) Partially restructured procedures to improve consistency
   and flow. Future patches will fully address general
   improvements.
2) Fixed Identity service configuration options.
3) Removed extraneous message broker configuration options.
4) Configured "my_ip" option on all distributions.
5) Added workaround for packaging bug on Ubuntu.

This patch originates from testing on Ubuntu only.

Change-Id: I61bbc1c13a24698973bbd0fb9a3ae00a4cd99f71
Merge "Update cinder content for Juno"