removed duplicated version property
removed duplicated version property

A duplicated exam.version property makes mvn still use version 1.2.0, although
already upgraded to 1.2.2

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

openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb,openengsb/openengsb