session.c: Replaced free(session->router_sesision) with call to freeSession callback
users.c: Removed reference to uninitialized variable.
router.h: Added freeSession callback to function block.
mysql_backend.c: try to ensure that client dcb is still listening in epoll_wait when writing reply to it.
mysql_common.c: assert debug build is mysql_protocol_init is called with dcb == NULL
readconnroute.c, readwritesplit.c, debugcli.c and testroute.c : Added freeSession to function block and an inmplementation of it.
Removed freeing router session object because it is not know at this phase whether session is really closed or not. Router session can be freed only when session is.
SkySQL MaxScale Thu Aug 8 00:01:08 2013
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2013 08/08 00:01:17 Selected server in port 3003 to as candidate. Connections : 0
2013 08/08 00:01:17 Examine server in port 3002 with 0 connections. Status is 5, inst->bitvalue is 6
2013 08/08 00:01:17 Examine server in port 3001 with 0 connections. Status is 5, inst->bitvalue is 6
2013 08/08 00:01:17 Examine server in port 3000 with 0 connections. Status is 3, inst->bitvalue is 6
2013 08/08 00:01:17 Final selection is server in port 3003. Connections : 1
2013 08/08 00:01:22 Selected server in port 3003 to as candidate. Connections : 1
2013 08/08 00:01:22 Examine server in port 3002 with 0 connections. Status is 5, inst->bitvalue is 6
2013 08/08 00:01:22 Examine server in port 3001 with 0 connections. Status is 5, inst->bitvalue is 6
2013 08/08 00:01:22 Examine server in port 3000 with 0 connections. Status is 3, inst->bitvalue is 6
2013 08/08 00:01:22 Final selection is server in port 3002. Connections : 1