(CPR-58) Move jenkins utilities into library

This commit goes through and takes all the jenkins based utilities in
00_utils.rake and mvoes them to jenkins.rb or net.rb as appropriate. It
deprecates old functions.
The only last little thing I was wondering about was the specificity in some of these comments. Since this is not Jenkins specific, should we make these comments a little more general? What happens if we use these methods for something other than creating a job? I'm not sure if that's worth it, but it's something to think about