To reproduce:

1. Open attached project
2. Make sure Animator window is visible
3. Select Cube in the Hierarchy
4. Press Play
5. Observe Animation playing in the Animator window
6. Disable and enable Cube game object
7. Observe Animation not playing in the Animator window

Expected: not looped animation resets after disabling and enabling game object
Actual: not looped animation does not reset after disabling and enabling game object

Reproduced in 5.6.0f1, 5.6.0f2, 5.6.0f3, 2017.1.0a5, 2017.1.0a6
Did not reproduce in 5.5.2p4, 5.5.3f1, 2017.1.0b1
Regression introduced in 5.6.0f1