BUG-1486: Pick Javassist version from odlparent

Rather than defining it ourselves, pick the one from global project
settings.

Change-Id: I1c672ff3f09e87b156a65a368635cfff95979684
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-1486: Pick Javassist version from odlparent"