ASLD: ASLD's XML reversible flag can turn off the reverse behavior now.

Previously, the android:reversible flag behaves like a suggestion.
Now it is used to enforce no reverse when set to false. In this way, user can
safely setup one direction animation only.
When set to true, but AVD can't reverse , then it will show a warning.

At the same time, update the tests to show different cases, including
AnimationDrawable.

b/18413484

Change-Id: I5552c49dcbd76b0724b4d5593bce8388b27bd905