Added session timeouts.

The parameter 'connection_timeout' for services takes a value as seconds.
All sessions that have been idle for longer than this will be disconnected.

server/modules/include/maxscaled.h

@@ -31,7 +31,7 @@
  */
 #include <dcb.h>
 #include <spinlock.h>
-
+#include <housekeeper.h>
 /**
  * The telnetd specific protocol structure to put in the DCB.
  */

server/modules/include/mysql_client_server_protocol.h

@@ -61,6 +61,7 @@
 #include <users.h>
 #include <dbusers.h>
 #include <version.h>
+#include <housekeeper.h>
 
 #define GW_MYSQL_VERSION "MaxScale " MAXSCALE_VERSION
 #define GW_MYSQL_LOOP_TIMEOUT 300000000

server/modules/include/telnetd.h

@@ -30,7 +30,7 @@
  * @endverbatim
  */
 #include <dcb.h>
-
+#include <housekeeper.h>
 /**
  * The telnetd specific protocol structure to put in the DCB.
  */

server/modules/protocol/maxscaled.c

@@ -144,6 +144,9 @@ char		*password;
 
 	if ((n = dcb_read(dcb, &head)) != -1)
 	{
+	    
+	dcb->last_read = hkheartbeat;
+	
 		if (head)
 		{
 			unsigned char *ptr = GWBUF_DATA(head);

server/modules/protocol/mysql_backend.c

@@ -448,6 +448,8 @@ static int gw_read_backend_event(DCB *dcb) {
                 /* read available backend data */
                 rc = dcb_read(dcb, &read_buffer);
                 
+		dcb->last_read = hkheartbeat;
+	
                 if (rc < 0) 
                 {
                         GWBUF* errbuf;

server/modules/protocol/mysql_client.c

@@ -576,6 +576,8 @@ int gw_read_client_event(
         CHK_PROTOCOL(protocol);
         rc = dcb_read(dcb, &read_buffer);
         
+	dcb->last_read = hkheartbeat;
+	
         if (rc < 0)
         {
                 dcb_close(dcb);

server/modules/protocol/mysql_common.c

@@ -170,6 +170,9 @@ int gw_read_backend_handshake(
 
 	if ((n = dcb_read(dcb, &head)) != -1) 
         {
+	    
+	dcb->last_read = hkheartbeat;
+	
 		if (head) 
                 {
 			payload = GWBUF_DATA(head);
@@ -420,6 +423,8 @@ int gw_receive_backend_auth(
 
         n = dcb_read(dcb, &head);
 
+	dcb->last_read = hkheartbeat;
+	
         /*<
          * Read didn't fail and there is enough data for mysql packet.
          */

server/modules/protocol/telnetd.c

@@ -156,6 +156,9 @@ char		*password, *t;
 
 	if ((n = dcb_read(dcb, &head)) != -1)
 	{
+	    
+	dcb->last_read = hkheartbeat;
+	
 		if (head)
 		{
 			unsigned char *ptr = GWBUF_DATA(head);