Do not change job parameters with env variables

[mgor]

This is basically a re-implementation of PR #77, or at least parts of it. Seems like it was already implemented except that the log messages still contained the unexpanded patterns which was a bit confusing.

Environment variables when expanded changed the job settings. It should only expand during the actual build, so that parameterized builds don't have to be reverted after every run.

Moved expansion a bit earlier, so that the log messages contains the patterns when they have been expanded.

Added a new testcase, that will fail without the changes to JacocoPublisher.java.