Significantly narrow the circumstances under which transports
will be re-bound. In particular, we now do not unbind + rebind
whenever any component in a bound transport's host package changes;
rather, we do so only when the transport component itself has
changed state, or when there is a state change that might cause
a new transport to become available.
Bug 19775237
Change-Id: Ib386875df19ffe9f2d3eb9f9788187338360644a
1a78d8c2b8