Add date to time formatted messages

[alblue]

On Darwin, messages are printed with the date as well:

Test Suite 'All tests' started at 2017-04-12 16:50:11.630

On Linux, messages used to be printed without the date:

Test Suite 'All tests' started at 16:06:28.533

Fixes SR-4573

[czechboy0]

Looks good, thanks!

[czechboy0]

@swift-ci please test

[alblue]

OK there are test outputs specifically looking for the date format without the year, so I'll fix them.

[briancroom]

Unfortunately the testing strategy in use here relies heavily on inspecting the output from the test runner, so a change like this which affects a lot of output will require extensive adjustments in the tests. That said, it should end up being a pretty mechanical set of changes.

[alblue]

@swift-ci please test

[czechboy0]

@swift-ci please test

[briancroom]

It looks like we may have a flaky test in PredicateExpectationsTestCase.test_delayedTruePredicateAndObject_passes, in that it is too time-dependent. Let's try the run again and see what happens.

[briancroom]

@swift-ci Please test OS X platform

[alblue]

@swift-ci please test os x platform

[alblue]

@swift-ci please clean test osx platform

[alblue]

So this test on OSX is flaky, and the change is for the Linux specific part of the build in any case. What do we do to move this forward?

[briancroom]

Since the test failure is clearly unrelated to your change, the Linux build shows that the tests have all been updated appropriately, and the failing OS X build isn't a part of the primary Swift CI, I'm fine with this going in as-is. Thanks for putting this together!

@alblue could you file a bug about the flaky test so that we don't lose track of it?