capture S3 execptions to show actual error messages

Author: Daman Arora

core/src/main/java/com/cloud/storage/template/S3TemplateDownloader.java

@@ -216,8 +216,15 @@ public void progressChanged(ProgressEvent progressEvent) {
             // Wait for the upload to complete.
             upload.waitForCompletion();
         } catch (InterruptedException e) {
-            // Interruption while waiting for the upload to complete.
-            logger.warn("Interruption occurred while waiting for upload of " + downloadUrl + " to complete");
+            errorString = "Interruption occurred while waiting for upload of " + downloadUrl + " to complete";
+            logger.warn(errorString);
+
+            status = Status.UNRECOVERABLE_ERROR;
+        } catch (Exception e) {
+            errorString = "S3 upload failed for " + downloadUrl + ": " + e.getMessage();
+            logger.warn(errorString, e);
+            
+            status = Status.UNRECOVERABLE_ERROR;
         }
 
         downloadTime = new Date().getTime() - start.getTime();