Resolve flaky statemachine tests

Resolve some timing errors with some tests that failed 2-5% of the time.
Overall, ensure that the state machine has an opportunity to settle
before going to next step.

Bug: 149857512
Test: atest BluetoothInstrumentationTests
Change-Id: I355e824435c0bfaab8bc3fd7b24874d4e56ddf32