simpleperf: add test_monitor.py to run script tests.

test_monitor.py is used to run tests for multiple devices in parallel
for multiple times. It helps test work when updating simpleperf
prebuilts.

Remove repeat testing and python version selection function in test.py,
since they are supported in test_monitor.py.

Also update DisplayBitmap*.apk. The old one can't be installed on
android version <= O.

Bug: 159823110
Test: run test_monitor.py.
Change-Id: If3a906fa5eee0eb96a43bdbd6a457b6fd00cc70a
4 files changed