Improve install guide cinder chapter

I improved the cinder chapter of the installation guide
as follows:

1) Renamed storage node files, titles, and XML IDs to
   conform with standards.
2) Rewrote introductory content to increase depth.
3) Clarified requirements for controller and storage nodes.
4) Added steps to configure storage node operating system
   prior to installing the volume service.
5) Rewrote LVM filter content because the original content
   was vague and confusing.
6) Added more command output.
7) Added 'cinder list' command to verify section.

I eventually want to restructure the architecture and basic
environment content to integrate organization and configuration
of optional nodes. Adding steps to configure the storage node
operating in this chapter temporarily fills a void.

Change-Id: Iaa404ee7b3fcbc0a14450cab6ae378f698890d7d
Implements: blueprint installation-guide-improvements
Merge "Improve install guide cinder chapter"