CircleCI: Skip greenmail-junit5 on JDK7 builds, as module requires JDK8
CircleCI: Skip greenmail-junit5 on JDK7 builds, as module requires JDK8

marcelmay/greenmail,marcelmay/greenmail,marcelmay/greenmail,greenmail-mail-test/greenmail,marcelmay/greenmail,greenmail-mail-test/greenmail,marcelmay/greenmail,greenmail-mail-test/greenmail