more robust api delete process, better failure logging

Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>

src/driver/freenas/api.js

@@ -3010,10 +3010,27 @@ class FreeNASApiDriver extends CsiBaseDriver {
     // NOTE: -R will recursively delete items + dependent filesets
     // delete dataset
     try {
+      await GeneralUtils.retry(
+        12,
+        5000,
+        async () => {
           await httpApiClient.DatasetDelete(datasetName, {
             recursive: true,
             force: true,
           });
+        },
+        {
+          retryCondition: (err) => {
+            if (
+              err.toString().includes("dataset is busy") ||
+              err.toString().includes("target is busy")
+            ) {
+              return true;
+            }
+            return false;
+          },
+        }
+      );
     } catch (err) {
       if (err.toString().includes("filesystem has dependent clones")) {
         throw new GrpcError(

src/driver/index.js

@@ -2607,7 +2607,7 @@ class CsiBaseDriver {
                 if (!result) {
                   throw new GrpcError(
                     grpc.status.FAILED_PRECONDITION,
-                    `it appears something else is already mounted at ${target_path}`
+                    `it appears ${normalized_staging_device} is already mounted at ${target_path}, should be ${normalized_staging_path}`
                   );
                 }
               }