[OPENENGSB-1823] Upgrade maven-release-plugin to 2.2
[OPENENGSB-1823] Upgrade maven-release-plugin to 2.2

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

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