#915 Increase request max length

Trying to send a WakeOnLan command to 150 clients I noticed that the
ogAdmClient closed (RST) the communication with the WebConsole without
answering or logging anything. The Webconsole logged:

	php: error occured during curl exec. Additioanl info: Array
	php: (
	php:     [url] => http://127.0.0.1:8888/wol
	php:     [content_type] =>
	php:     [http_code] => 0
	php:     [header_size] => 0
	php:     [request_size] => 199
	php:     [filetime] => -1
	php:     [ssl_verify_result] => 0
	php:     [redirect_count] => 0
	php:     [total_time] => 1.003122
	php:     [namelookup_time] => 4.9E-5
	php:     [connect_time] => 0.000273
	php:     [pretransfer_time] => 0.00035
	php:     [size_upload] => 7007
	php:     [size_download] => 0
	php:     [speed_download] => 0
	php:     [speed_upload] => 6986
	php:     [download_content_length] => -1
	php:     [upload_content_length] => 7007
	php:     [starttransfer_time] => 1.001793
	php:     [redirect_time] => 0
	php:     [redirect_url] =>
	php:     [primary_ip] => 127.0.0.1
	php:     [certinfo] => Array
	php:         (
	php:         )
	php:
	php:     [primary_port] => 8888
	php:     [local_ip] => 127.0.0.1
	php:     [local_port] => 43016
	php:     [http_version] => 0
	php:     [protocol] => 1
	php:     [ssl_verifyresult] => 0
	php:     [scheme] => HTTP
	php: )

This happened because request max length is set to 4096 bytes and my
request had a size of 7075 bytes. So, the max length was exceeded.

This commit increase the max length from 4096 to 16384. This way the
ogAdmServer supports larger request messages.

sources/ogAdmServer.c

@@ -130,7 +130,7 @@ enum og_client_state {
 	OG_CLIENT_PROCESSING_REQUEST,
 };
 
-#define OG_MSG_REQUEST_MAXLEN	4096
+#define OG_MSG_REQUEST_MAXLEN	16384
 
 /* Shut down connection if there is no complete message after 10 seconds. */
 #define OG_CLIENT_TIMEOUT	10