BUG-1425: fix builder's implementation of equals()

With the advent of LazyDataObject, we have two implementation which need
to compare as equal. LazyObject.equals(builderObject) already works, but
we need the revers to be true, too. This patch sets out to do exactly
that.

Change-Id: I931f66a9088451524a842f6a67e8492ac922fd3d
Signed-off-by: Robert Varga <rovarga@cisco.com>