REGRESSION(r148588): It broke the Qt WK2 EWS
https://bugs.webkit.org/show_bug.cgi?id=114737

Reviewed by Jocelyn Turcotte.

* Scripts/webkitpy/common/config/ews.json: "Qt WK2 EWS" should use qt-wk2 port.
* Scripts/webkitpy/common/config/ports.py:
(DeprecatedPort.port):
(QtPort.build_webkit_command): qt port shouldn't build WebKit2.
(QtPort.run_webkit_tests_command): qt port runs WK1 tests.
(QtWK2Port): Added.
(QtWK2Port.build_webkit_command): qt-wk2 port builds WK1 and WK2 too.
(QtWK2Port.run_webkit_tests_command): qt-wk2 port runs WK2 tests.
* Scripts/webkitpy/common/config/ports_unittest.py:
(DeprecatedPortTest.test_qt_port):
(DeprecatedPortTest):
(DeprecatedPortTest.test_qt_wk2_port):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148608 268f45cc-cd09-0410-ab3c-d52691b4dbfc