Add phpinfo() as info.php to the root

Since this is a development machine, we need a standard way
to identify any issues with configuration. Having a standard
http://127.0.0.1:8080/info.php way to check that PHP has been
configured properly could be very usefull, especially when
helping new users.

Change-Id: Iae3b8654195e12a21bf48aa13becaeb2f28f2101