Revert "Fix the bug that GPFDIST_WATCHDOG_TIMER doesn't work."

This reverts commit 6e76d8a1.

Saw pipeline failure in ubuntu jobs. Not look like flakiness.

src/bin/gpfdist/gpfdist.c

@@ -3611,7 +3611,6 @@ int gpfdist_init(int argc, const char* const argv[])
 
 	if (wd != NULL)
 	{
-		errno = 0;
 		val = strtol(wd, &endptr, 10);
 
 		if (errno || endptr == wd || val > INT_MAX)

src/bin/gpfdist/regress/test_watchdog.sh

@@ -2,17 +2,10 @@
 
 GPFDIST_PID=gpfdist.pid
 
-export GPFDIST_WATCHDOG_TIMER=5
+export GPFDIST_WATCHDOG_TIMER=3
 gpfdist &
 PID=$!
 
-sleep 3
-ps -p $PID
-if [ $? -ne 0 ]; then
-wait $PID
-echo "gpfdist should be running, failed"
-exit 1
-fi
 sleep 5
 ps -p $PID
 if [ $? -eq 0 ]; then