Add support.multidex tests app for an update bug.

The failing scenario is
- install v1
- run
- update to v2
- update to v3
- run
last run was failing with initial multidex library versions because
it's still running on v1 extracted secondary dex files.

(cherry picked from commit 05e2a94c)

Change-Id: Ibb5d16642b127ee4c0baddc4f6ba461c11d25f90