cannot delete workspace ... invoker-reports/BUILD-***.xml

[Tibor Digana]

I think we should downgrade maven-shared-utils to 3.1.0 in the m-invoker-p
because we found the same problem in surefire:3.0.0-M1.
We did not have time to fix it and I have realized the connection to the
Invoker just now.
Faster than a release is to deploy SNAPSHOT version of the Invoker and use
it in JAR plugin and we will see again fully working Jenkins build
https://builds.apache.org/job/maven-box/job/maven-jar-plugin/job/MJAR-238/
The precondition is to ask the INFRA to restart all Windows or kill all
Java processes.
T