(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.
Do you want to reuse the same "which way to curl" method as above or just assume that this is always the path to `curl`? because it's about 50/50 on it being `/usr/bin/curl`.