BUG-648: fix util building
BUG-648: fix util building

It turns out that the util package had incorrect build instructions,
resulting in unresolved dependencies. Fix that.

Change-Id: I3ba8ecc5070b2d7aa1804f52511437cca6e504d9
Signed-off-by: Robert Varga <b8bd3df785fdc0ff42dd1710c5d91998513c57ef@cisco.com>

opendaylight/yangtools,522986491/yangtools,opendaylight/yangtools,NovusTheory/yangtools