[OPENENGSB-2973] Speed up multimodule build
[OPENENGSB-2973] Speed up multimodule build

With a newer version of the plexus plugin the build of modules could be
speed up by ~50%. That's definitely worth the change.

Signed-off-by: Andreas Pieber <57efbcbb22ec0bd89955a40df26b44c340d3e38d@gmail.com>

GitHub2020/openengsb-root,openengsb/openengsb-root,openengsb/openengsb-root,GitHub2020/openengsb-root