Add Efl WebKit2 EWS bot
https://bugs.webkit.org/show_bug.cgi?id=114564

Reviewed by Ryosuke Niwa.

Added EflWK2EWS, and add myself a watcher for EflWK2EWS.
Also add a deprecated EflWK2Port class.

Besides clean up eflews watchers.

* QueueStatusServer/config/queues.py:
* Scripts/webkitpy/common/config/ews.json:
* Scripts/webkitpy/common/config/ports.py:
(DeprecatedPort.port):
(EflPort.build_webkit_command):
(EflWK2Port):
(EflWK2Port.build_webkit_command):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148589 268f45cc-cd09-0410-ab3c-d52691b4dbfc