AudioManagerTest
- merge shouldGetVolume and shouldSetVolume into one test
- added new tests for shadowAudioManager specific methods and also to test that set voumue will not exceed range.
- reworked  shouldGetStreamMaxVolume() and shouldGetAndSetVolume() to test for all valid streams.

ShadowAudioManager
- added a higher max volume for music and dtmf streams
- ensure set volume will not be below 0 or exceed maxVolume
- removed setFlags method,