i3 - improved tiling WM

Testcases: ignore Xorg config dir when starting Xdummy

Patch status: merged

Patch by Tony Crisci

Long description:

Start Xdummy with '-configdir /dev/null' to avoid conflicting settings
in xorg.conf.d.

To apply this patch, use:
curl http://cr.i3wm.org/patch/262/raw.patch | git am

b/testcases/lib/StartXDummy.pm

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@@ -113,7 +113,7 @@ sub start_xdummy {
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         # actual system X configuration.
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         my $socket = fork_xserver($keep_xdummy_output, $displaynum,
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                 './Xdummy', ":$displaynum", '-config', '/dev/null',
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-                '-nolisten', 'tcp');
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+                '-configdir', '/dev/null', '-nolisten', 'tcp');
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         push(@displays, ":$displaynum");
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         push(@sockets_waiting, $socket);
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         $displaynum++;