performance-metrics: Exit binary with non-zero exit code on test failure

This ensures that partial reports are not generated.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

performance-metrics/src/main.rs

@@ -488,7 +488,7 @@ fn main() {
                 }
                 Err(e) => {
                     eprintln!("Aborting test due to error: '{:?}'", e);
-                    break;
+                    std::process::exit(1);
                 }
             };
         }