[GTK] Actually use --release and --debug command line options in run-gtk-test

[GTK] Actually use --release and --debug command line options in run-gtk-test
https://bugs.webkit.org/show_bug.cgi?id=81234

Reviewed by Philippe Normand.

Actually handle --release and --debug command line options to
create the build directory, falling back to current hack to detect
whether it's a Release or Debug build when both options are missed.

* Scripts/run-gtk-tests:
(TestRunner.__init__): Receive options too.
(TestRunner._get_top_level_directory): Helper function to get the
top level directory.
(TestRunner._get_build_directory): Helper function to get the
build directory depending on --release/--debug command line
options or gessing it if both options are missing.
(TestRunner._ensure_accessibility_daemon_is_running): Use
self-options now.
(TestRunner.run): Ditto.
(TestRunner.run.run_tests): Pass options to the constructor
instead of run().

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@110866 268f45cc-cd09-0410-ab3c-d52691b4dbfc