Build all Install Guides and HA Guide in gates

Build books the same way we build them for publishing:

Build all three variants of the Install Guides if we check building.
Since we introduce os specific sections, the guide might build for one
variant but not the others.

In case of failure, the variant is shown like:
Building all queued 1 books now...
>>> Build of book install-guide (for Ubuntu) failed (returncode = 1).

Also, generate the xml file for the HA guide and build it.

Add generated file bk-ha-guide.xml to .gitignore

Add parameter -B for building to mvn to silence download progress

Run test.py and validate.py through pep8 and fix any issues

Change-Id: Icfb4587e7c08050d1b65dddc5a3a810a8bf12f5a
Remove use of fixed_range from docs

fixed_range in nova.conf was deprecated in Grizzly and has been
removed in Havana.

Change-Id: I663ab54260ab7a6041b951598b901cf95a259df3
Closes-Bug: 1207559
Merge "Build all Install Guides and HA Guide in gates"
Merge "Remove use of fixed_range from docs"