Camera2: Add a reprocess JPEG EXIF test

Add a test to verify the JPEG EXIF data in reprocess outputs.

Moved some test code from StillCaptureTest to CameraTestUtils so it
can be shared by StillCaptureTest and ReprocessCaptureTest.

Added a function to get the right reprocess output image reader and
image reader listener based on whether the test case shares the same
image reader for regular output and reprocess output.

Bug: 21285757
Change-Id: I8d5a2f85023dc52924c31a389892d2932d0907f9
3 files changed