Add variable ANDROID_NO_TEST_CHECK to not build all test modules

Introduce a way to speed up local builds. Don't build all test
modules if ANDROID_NO_TEST_CHECK is set to true.

On master branch this reduces what is built by more than
300 apps and 50 java libraries. Time for doing this on a
12 core machine running with -j13 is about 10 minutes.

Change-Id: I90feb108695ee60d0dbbf497644f767cc3748215