Test arguments passed to surefire plugin override Jacoco agent arguments

[massdosage]

This has more details (and lots of discussions on various possible ways to solve the issue):

https://stackoverflow.com/questions/23190107/cannot-use-jacoco-jvm-args-and-surefire-jvm-args-together-in-maven

Basically, we currently set the arguments passed to the surefire plugin to only be the test.arguments property which means any arguments set (e.g. by the Jacoco plugin in this case) are lost.

Acceptance Criteria

• Surefire plugin allows additional command line arguments to be passed in
• Above is tested on a downstream project which sets test.arguments and is also using Jacoco (this is current failing with Jacoco not generating any .exec files)