net: Revert "tftp: adjust settings to be suitable for 100Mbit ethernet"

Commit 620776d "tftp: adjust settings to be suitable for 100Mbit ethernet"
causes the following error message when trying to load a file using 'tftp'
command via a tftp server.

    TFTP error: 'Unsupported option(s) requested' (8)

This is due to with commit 620776d changes, the tftp option 'timeout'
value is now set to zero which is an invalid value as per RFC2349 [1].
Valid values range between "1" and "255" seconds, inclusive. With some
tftp servers that strictly implement the RFC requirement, it reports
such an error message.

Revert commit 620776d for RFC compliance.

[1] https://www.ietf.org/rfc/rfc2349.txt

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

net/tftp.c

@@ -19,10 +19,10 @@
 /* Well known TFTP port # */
 #define WELL_KNOWN_PORT	69
 /* Millisecs to timeout for lost pkt */
-#define TIMEOUT		100UL
+#define TIMEOUT		5000UL
 #ifndef	CONFIG_NET_RETRY_COUNT
 /* # of timeouts before giving up */
-# define TIMEOUT_COUNT	1000
+# define TIMEOUT_COUNT	10
 #else
 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
 #endif
@@ -711,10 +711,10 @@ void tftp_start(enum proto_t protocol)
 	if (ep != NULL)
 		timeout_ms = simple_strtol(ep, NULL, 10);
 
-	if (timeout_ms < 10) {
-		printf("TFTP timeout (%ld ms) too low, set min = 10 ms\n",
+	if (timeout_ms < 1000) {
+		printf("TFTP timeout (%ld ms) too low, set min = 1000 ms\n",
 		       timeout_ms);
-		timeout_ms = 10;
+		timeout_ms = 1000;
 	}
 
 	debug("TFTP blocksize = %i, timeout = %ld ms\n",