Prevant test failures on tearDown()

While test runs, tearDown() is called even there are some fauilres
in setUp(). Therefore tearDown() should only clear values that were
executed in setUp().

Bug: 305287964
Bug: 304721663
Bug: 303156122
Bug: 280518449
Bug: 292012215
Bug: 298398008
Bug: 304705063
Bug: 304969746
Bug: 305110553
Test: atest BluetoothInstrumentationTests
Change-Id: I3ed50b4b73ce3a07b45955b2649fed72e3ee82dc