Fixes #14  - Versions of plugins.

Cloudbees is complaining about the source code plugin
not being set, and it can't find a class using the 2.10 version of Surefire,
which I am not having as a problem. Upgrading to 2.17 to see if this
can sort it out.

Change-Id: Ic0e007aea14cdb3d8038b2ca2328515b833dbca6