Camera2: Fix Camera integration test deadlock

The problem was: when SurfaceTexture is used, test didn't acquire/release
images when they are produced, then it starves the producer and
cause deadlock. This change replaces SurfaceTexture with ImageReader, release
every image produced immediately.

Bug: 10360518
Change-Id: I9aabaee23013277c2da6f5825ac931bc10511fbc