PLFM-2178 Enable CloudWatch metrics on TrashController.
PLFM-2032 Add Java docs for TrashController.
Merge pull request #688 from eric-wu/develop

PLFM-2177 Fix data migration order for DBOStorageQuota.
Merge pull request #689 from eric-wu/quickfix

PLFM-2178, PLFM-2032 Add Java docs and CloudWatch metrics to trash controller