simpleperf: split test progress and log of test.py.

Currently test.py outputs both test progress and log in stderr,
making output hard to parse. So only keep test progress in
stderr, and move verbose log to test_python_{2,3}.log.

Since we keep test logs, continue testing even when some tests fail.

Also move deprecated assertEquals to assertEqual.

Bug: 140958894
Test: run test.py.
Change-Id: I11c168cbc934055b47a3df44fc6d568824282702
1 file changed