Bug 1817 - Have the md-sal-broker feature reference the yangmodels feature (which are core yangs)

Change-Id: I771d78b7d03d2b8c45fcf2c00c9701bed7e034e4
Signed-off-by: Devin Avery <devin.avery@brocade.com>
Merge "Bug 1817 - Have the md-sal-broker feature reference the yangmodels feature (which are core yangs)"