Use mockito-core instead of mockito-all.
Use mockito-core instead of mockito-all.

mockito-all seems to contain old version of hamcrest-core.

Change-Id: I433d2baaa4c2e14ef5315afd0ee6616d763becda
Signed-off-by: Shigeru Yasuda <4286dc62f6b184926d282535950a80f031d65860@da.jp.nec.com>

opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn,opendaylight/vtn