NRWT is not printing out the builder it's uploading JSON files for

NRWT is not printing out the builder it's uploading JSON files for
https://bugs.webkit.org/show_bug.cgi?id=82834

Reviewed by Ojan Vafai.

Handle log messages of the form log.info("%s", arg) properly ...
I didn't even know you could do that :).

* Scripts/webkitpy/layout_tests/views/metered_stream.py:
(_LogHandler.emit):
* Scripts/webkitpy/layout_tests/views/metered_stream_unittest.py:
(RegularTest.test_log_args):
(VerboseTest.test_log_args):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@112944 268f45cc-cd09-0410-ab3c-d52691b4dbfc