install-guide: minor fixes on the glance chapter

Use colons where appropriate.
Fix the formatting of code examples.
Small updates to reflect that some elements must be created/modified.

Change-Id: Icd069533e8f47c9f9f99eb1cfbabc3ad1c3ca427
install-guide: minor fixes

Fix some minor issues in the first chapter of the install guide.

Add a note about installing a backported kernel for Networking on Ubuntu
12.04.

Don't install mysql/mariadb clients on compute and network nodes,
python-mysqldb is enough.

Change-Id: I36e91dce7d2f90b87cd8e725ec80c1e18058753c
Added directory check to cron job creation.

Added ability to check for directory so that this cron job
creation will work in both RPM-based distributions as well
as in DEB-based distributions.

(Found entity problem with '&' character - fixed.)

Updated to use operating-system specific screen tags.

Fixes bug: 1299674

Change-Id: I1b4b3111da0e3859d38c8963fe5e45432682f284
Merge "install-guide: minor fixes"
Merge "install-guide: minor fixes on the glance chapter"
Add LBaaS extension terms to glossary

Change-Id: Ic57735a0282690b4b394c8ea41bfa76fa4a88c16
author: diane fleming
Remove obsolete glossary entry Volume Service API

This entry has been obsoleted, remove it.

Change-Id: I2faf22eec0784bb403817d96b50ec8921b778593
Merge "Add LBaaS extension terms to glossary"
Merge "Added directory check to cron job creation."
Merge "Remove obsolete glossary entry Volume Service API"