Preventing retentionTime and retentionCount to be set to 0

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 70.22%. Comparing base (52ba813) to head (b3cd46f). Report is 16 commits behind head on master.

Files	Patch %	Lines
...rc/main/java/com/github/ambry/account/Dataset.java	85.71%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2790 +/- ## ============================================ + Coverage 64.24% 70.22% +5.98% - Complexity 10398 11678 +1280 ============================================ Files 840 840 Lines 71755 71920 +165 Branches 8611 8647 +36 ============================================ + Hits 46099 50509 +4410 + Misses 23004 18775 -4229 + Partials 2652 2636 -16 ```

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