BUG-6958: remove yang-data-{api,util} from odl-yangtools-yang-data
BUG-6958: remove yang-data-{api,util} from odl-yangtools-yang-data

Now that yang-data-api and yang-data-util are provided by
odl-yangtools-yang-parser, and since odl-yangtools-yang-data depends
on odl-yangtools-yang-parser, there's no need to keep them in
odl-yangtools-yang-data.

Change-Id: If568088907c16e32d63f6475b7120bca09df1be2
Signed-off-by: Stephen Kitt <c64219c0e25aff6572376b1dfbf7cf444494f5c6@redhat.com>

opendaylight/yangtools,opendaylight/yangtools