Cobertura can't handle Java 8: https://github.com/cobertura/cobertura/issues/176
We should switch to JaCoCo and start setting some test coverage goals.
Set test coverage to 40%(not enforced yet: some modules have even less)
- Remove Cobertura
- Remove cobertura:cobertura in Jenkins
- Generate Jacoco reports in Jenkins
- Maven verify will generate Jacoco coverage