Improve install guide cinder controller section

I improved the cinder controller section of the installation
guide as follows:

1) Reordered instructions.
2) Added python-cinderclient package to all distributions.
3) Added glossary terms.

Change-Id: Idecafff0a1cd2f98ca7d2666bd1e402df341de7a
Implements: blueprint installation-guide-improvements
Co-Authored-By: Matt Kassawara <mkassawara@gmail.com>
Merge "Improve install guide cinder controller section"