[test-webkitpy] Make more than two -v options to be also verbose.
[test-webkitpy] Make more than two -v options to be also verbose.

Passing more than two -v arguments for the test-webkitpy script
turned off debug logging.

BUG=none

Review URL: https://codereview.chromium.org/564173003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@182226 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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