Bug #385 http://bugs.skysql.com/show_bug.cgi?id=385

dcb.c:dcb_write accept also dcb state DCB_STATE_NOPOLLING since it only means that dcb has been removed from epoll set but it is still possible to write to it.

Bug #384 http://bugs.skysql.com/show_bug.cgi?id=384
session.h:added new state for SESSION, SESSION_STATE_ROUTER_READY which follows SESSION_STATE_READY. The difference is that ROUTER_READY is set only after router session is successfully created while READY means that session still lacks router.
session.c:set SESSION_STATE_ROUTER_READY when router is created.
mysql_backend.c:gw_read_backend_event, added SESSION_STATE_ROUTER_READY check before router session is closed. Changed chec kso that it doesn't block in infinite loop (although it shouldn't be possible anyway).
mysql_backend.c:gw_error_backend_event, added similar check before session is closed.

server/modules/routing/readwritesplit/readwritesplit.c

@@ -315,7 +315,6 @@ static void* newSession(
         client_rses->master_dcb = dcb_connect(be_master->backend_server,
                                              session,
                                              be_master->backend_server->protocol);
-
         if (client_rses->master_dcb == NULL)
 	{
                 /** Close slave connection first. */
@@ -543,7 +542,7 @@ static int routeQuery(
 
         if (rses_is_closed || (master_dcb == NULL && slave_dcb == NULL))
         {
-                LOGIF(LE, (skygw_log_write(
+                LOGIF(LE, (skygw_log_write_flush(
                         LOGFILE_ERROR,
                         "Error: Failed to route %s:%s:\"%s\" to backend server. "
                         "%s.",