[WIP] Use trollop option parsing for git reference instead of VERSION file

The VERSION file path as part of the nightly build scripts was not reliable.

Additionally, it feels ugly that the build code used to generate the kickstarts for the appliances needs to have access to the VERSION file from the desired branch/tag/reference.
- No need for the short...they are automatic.
- If the default type is "test", then you can put it here and not have the extra branch on the case statement in build.rb