Adding support for loading classes/methods from file

Added testFile argument to AndroidJunitRunner which allows to run all tests listed in a file:
adb shell am instrument -w -e testFile /sdcard/tmp/testFile.txt com.android.foo/com.android.test.runner.AndroidJUnitRunner

The file should contain a list of line separated test classes and methods.

bug: 16031984

Change-Id: Idf3e5e12f65ed670f31dad54bf3f0e303114c755
(cherry picked from commit da785cf4556f8bfc347c8118b42c74dc0ec59f58)
5 files changed