mod_blacklist: Add example configuration file

Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

conf/autoload_configs/blacklist.conf.xml

+<configuration name="mod_blacklist.conf" description="Blacklist module">
+<lists>
+	<!-- Example blacklist, the referenced file contains blacklisted items, one entry per line
+	<list name="example" filename="/usr/local/freeswitch/conf/blacklists/example.list"/>
+	-->
+</lists>
+</configuration>