Adding openpojo as test dependency in parent

Adding openpojo as test dependency in parent

Adding openpojo as test dependency in parent so that other child
projects in policy can use this for testing pojo classes. openpojo seems
to be very efficient way of testing pojo classes fully without writing
too many lines of test code. Once this is merged, will raise a reviews of
policy/common & policy/distribution showing its usage.

Change-Id: I23fc237467a9f797710b8eb80ce7bb0a75c3aec9
Issue-ID: POLICY-1035
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>