conf: add config files to module directories

The idea here is that the config files in the module directories will
serve as the canonical documentation of all module configuration
options.

src/mod/applications/mod_memcache/conf/autoload_configs/memcache.conf.xml

@@ -0,0 +1,6 @@
+<configuration name="memcache.conf" description="memcache Configuration">
+  <settings>
+    <!-- comma sep list of servers: eg:  localhost,otherhost:port,anotherone -->
+    <param name="memcache-servers" value="localhost"/>
+  </settings>
+</configuration>

src/mod/applications/mod_memcache/conf/dialplan/memcache.xml

@@ -0,0 +1,9 @@
+<include>
+	<extension name="memcache_examples">
+		<condition field="destination_number" expression="^memcache$">
+			<action application="set" data="foo=${memcache(get key)}"/>
+			<action application="set" data="ignore=${memcache(set key value)}"/>
+			<action application="set" data="ignore=${memcache(set key ${channel_var})}"/>
+		</condition>
+	</extension>
+</include>