Move graphicstests to coretests

Two reason for merge:
1. Currently graphicstests aren't runned as part of acpt
2. Separation was confusing: android.graphics package existed in both apks: frameworks & coretests.

Test: refactoring CL.
Change-Id: I0ade3ebbc2d06074ae81a2c390475f1f434dd873
26 files changed