See https://builds.apache.org/job/maven-box/job/maven/job/MNG-6656/41/
Changes: * Use Maven 3.6.3 for Linux builds, it should already be on all nodes * Use Java 8 for Java 7 builds - due to the temporary removal of Java 7 * Revert tests with unneeded changes * [MNG-6656] Replace CacheManager with already existing ReactorModelPool All tests passed
