Add ImageReader CTS test for camera

* Add very basic ImageReader test for camera.
* Cover YUV stream and jpeg capture and only test flexible YUV and JPEG format
* Create a utility class for common utility functions

Bug 9802344
Change-Id: I4fdc40245a038d59cf23f3f1c0211fd60d43f390

Conflicts:
	tests/tests/hardware/src/android/hardware/camera2/cts/CameraTestUtils.java
	tests/tests/hardware/src/android/hardware/camera2/cts/ImageReaderTest.java