Group EFL bots into a category on the buildbot master

Group EFL bots into a category on the buildbot master
https://bugs.webkit.org/show_bug.cgi?id=82712

Patch by Dominik Röttsches <dominik.rottsches@linux.intel.com> on 2012-04-13
Reviewed by Adam Roben.

Creating a new category definition on the buildbot frontend.

* BuildSlaveSupport/build.webkit.org-config/master.cfg:
(loadBuilderConfig): Determine category for EFL bots
* BuildSlaveSupport/build.webkit.org-config/templates/root.html: Add links to EFL category

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114132 268f45cc-cd09-0410-ab3c-d52691b4dbfc