[TD-5838-master]<test>:add nettest for TCP/UDP/FQDN

tests/nettest/FQDNnettest.sh

+#!/bin/bash
+
+taos -n fqdn

tests/nettest/TCPUDP.sh

+#!/bin/bash
+
+for N in -1 0 1 10000 10001
+do
+	for l in 1023 1024 1073741824 1073741825 
+	do
+		for S in udp tcp 
+		do
+			taos -n speed -h BCC-2 -P 6030 -N $N -l $l -S $S 2>&1 | tee -a result.txt
+		done
+	done
+done