CompoundFailure may be nested, ReportStageFailureToCIDB should insert all exceptions into failureTable.

+---------+----------------+------------------+----------------+---------------------------------------------------------------------+--------------------+------------+---------------------+
| id      | build_stage_id | outer_failure_id | exception_type | exception_message                                                   | exception_category | extra_info | timestamp           |
+---------+----------------+------------------+----------------+---------------------------------------------------------------------+--------------------+------------+---------------------+
| 1895129 |       38053984 |          1895127 | TestLabFailure | ** HWTest did not complete due to infrastructure issues (code 3) ** | lab                | NULL