Fixing Rollback for compaction/commit operation, added check for null commit

- Fallback to old way of rollback by listing all partitions
	- Added null check to ensure only partitions which are to be rolledback are considered
	- Added location (committime) to workload stat
	- Added checks in CompactedScanner to guard against task retries
	- Introduce new logic for rollback (bounded by instant_time and target_instant time)
        - Reversed logfiles order

hoodie-client/src/main/java/com/uber/hoodie/io/HoodieAppendHandle.java

@@ -187,7 +187,7 @@ public class HoodieAppendHandle<T extends HoodieRecordPayload> extends HoodieIOH
       }
     } catch (Exception e) {
       throw new HoodieAppendException(
-          "Failed while appeding records to " + currentLogFile.getPath(), e);
+          "Failed while appending records to " + currentLogFile.getPath(), e);
     }
   }