Rename AppFuseTest in perf test package to AppFusePerfTest.

Previously we have two AppFuseTest class in the normal test and the perf
test. The CL renames the one in the perf test to different name.

Bug: 31982374
Test: adb shell am instrument -w com.android.mtp.perftests/android.support.test.runner.AndroidJUnitRunner
Change-Id: I6272d7f78cead0bfeee7cf83ed50c77658caa1c0
1 file changed