[CBRD-24719] Add Proxy and CAS status check function (#4246)

http://jira.cubrid.org/browse/CBRD-24719

When JDBC/CCI requests a query and does not receive a response for more than 10 seconds, the driver checks the CAS status through the broker.
However, when a shard is set, the shard broker does not have a function to check the status of the proxy and cas, so the driver judges that there is an error in the proxy and cas and terminates the communication.
A function that can check the status of proxy and cas should be added through Broker for Shard.

src/broker/broker.c

@@ -873,7 +873,11 @@ receiver_thr_f (void *arg)
 	  memcpy ((char *) &session_id, cas_req_header + 6, 4);
 	  session_id = ntohl (session_id);
 
-	  if (shm_br->br_info[br_index].shard_flag == OFF)
+	  if (shm_br->br_info[br_index].shard_flag == ON)
+	    {
+	      status = FN_STATUS_BUSY;
+	    }
+	  else
 	    {
 	      for (i = 0; i < shm_br->br_info[br_index].appl_server_max_num; i++)
 		{