Camera2: Tests: Release streams after HAL is unloaded: DO NOT MERGE

This fixes a segfault in the HAL where it was trying to write to a locked buffer
that disappeared from underneath it.

Any users of CameraModuleFixture should now call SetUp/TearDown explicitly.
Other classes remain unchanged until we need a custom TearDown order for them.

Change-Id: Ia2dc3ac3e2497d9ede9b580f6e10cf9ec646bdab
3 files changed