BUG-650: ResolveDataChangeState.inheritedOne should be a Collection

There is no need to demote this to Iterable just to then use
Iterables.isEmpty(), as we are always initializing it with a collection,
which has a quick isEmpty() method. Also promote its order before
interitedSub, so the slow path can be faster a bit.

Change-Id: Ic536e2420cfae98941ec638510c98ec3a8230c09
Signed-off-by: Robert Varga <rovarga@cisco.com>