Try dumping the server log on failure

test/s3-setup.sh

@@ -192,6 +192,7 @@ while [ $RC -ne 0 ]; do
     echo "Waiting for minio to start ($IDX seconds so far) ..."
   fi
   if [ $IDX -eq 10 ]; then
+    cat "$BINARY_DIR/tests/$TEST_NAME/server.log"
     echo "minio failed to start - failing"
     exit 1
   fi