Deprecated platform Android testing APIs

- Deprecated most android.test.* APIs
- Kept ProviderTestCase2 and LoaderTestCase since we don't have a
replacement yet
- Deprecated android.test.suitebuilder
- Added Javadoc to all deprecated APIs with links to corresponding
Android Testing Support Library APIs
- Removed all trailing whitespace

Bug: 22314304
Change-Id: I1b1f0dd5132364110f1dfd4e3eb2dd044700d859