[autotest] Blacklist unit tests that require selenium

CL adds a new class of skipped tests to utils/unittest_suite.py

BUG=chromium:239255
TEST=utils/unittest_suite.py no longer fails the following tests:
	'ap_configurator_factory_unittest.py',
        'chaos_base_test_unittest.py',
        'ap_batch_locker_unittest.py'

Change-Id: I1a4810669caf436d4b820fd2a88ec5ca3db634e1
Reviewed-on: https://gerrit.chromium.org/gerrit/50888
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Tan Gao <tgao@chromium.org>
1 file changed