New maven submodule patch cause report to be unreliable

This has been observed in YARN-7129, and YARN-9255.  When new maven submodule is in the patch.  Patch version 1 failed findbug checks.  The subsequent patch will continue to report wrong result for fixed failures.  Sometimes, it also hides newly introduced errors in findbugs report until other Jira issues to discover the hidden failures.  There seems to be some incorrect logic in computing delta between reports because the submodule is a newly introduced in the patch.  Yetus does not have correct frame of reference of previous state of report.  This cause the result to have false positives.