run-webkit-test outputs the wrong number of tests executed when some are skipped.

run-webkit-test outputs the wrong number of tests executed when some are skipped.
https://bugs.webkit.org/show_bug.cgi?id=89894

Reviewed by Ojan Vafai.

Fix the logging of the actual number of tests run so that tests
that are skipped aren't included.

Also revamp the 'expected' output so we distinguish the number
of tests found from the number of tests run (to account for
--repeat-each and --iterations).

Covered by existing tests.

* Scripts/webkitpy/layout_tests/controllers/manager.py:
(Manager.prepare_lists_and_print_output):
(Manager._log_num_workers):
(Manager.run):
(Manager._print_result_summary):
* Scripts/webkitpy/layout_tests/models/result_summary.py:
(ResultSummary.__init__):
(ResultSummary.add):
* Scripts/webkitpy/layout_tests/views/printing.py:
(Printer.print_one_line_summary):
* Scripts/webkitpy/layout_tests/views/printing_unittest.py:
(Testprinter.test_print_one_line_summary):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@122659 268f45cc-cd09-0410-ab3c-d52691b4dbfc