fix test=develop (#26697)

python/paddle/fluid/tests/unittests/dist_test.sh

@@ -61,7 +61,14 @@ for i in {1..2}; do
     fi
 done
 
+echo "dist space:"
+df -h
+
 #display /tmp/files
+echo "ls /tmp/paddle.*"
 ls -l /tmp/paddle.*
 
+echo "ls -l ./"
+ls -l ./
+
 exit 1