MinIO: Minor Bug Fix Release

## Highlights - **Breaking Change** DeleteFileBulk API has been changed. See(#8926) for more details. - Improvements to data usage. See(#8961, #8959, #8952, #8957) for more details. - KMS Admin improvements. See (#8944, #8943, #8936) for more details. - Accounting Admin API. See (#8689) for more details. - Bucket Encryption APIs. See (#8890) for more details. - Object tagging support in Lifecyle configuration. See(#8880) for more details. - Add `diagnostics` canned policy along with the existing ones. See (#8937) for more details. ## Changelog - Fix stream read IO count (#8961) (02/07/20) - Time getSize and use to estimate latency (#8959) (02/07/20) - usage typo: Fix creating .minio.sys/background-ops bucket (#8957) (02/06/20) - Add metadata parsing to be inside mutex to slow down (#8952) (02/06/20) - Aws SDK go functional test: add SSE-C CopyObject test (#8938) (02/06/20) - Add support for Object Tagging in LifeCycle configuration (#8880) (02/06/20) - Fix docs link for vault legacy (#8948) (02/06/20) - Avoid object names with '//' to avoid hash inconsistencies (#8946) (02/06/20) - fix and improve KMS server info (#8944) (02/06/20) - refine the KMS admin API (#8943) (02/05/20) - Add support for bucket encryption feature (#8890) (02/05/20) - re-write the KMS get started guide (#8936) (02/05/20) - Add new admin API to return Accounting Usage (#8689) (02/04/20) - Add canned `diagnostics` policy for admin users (#8937) (02/04/20) - Avoid unnecessary statPart() calls in PutObjectPart (#8905) (02/04/20) - Allow caching based on a configurable number of hits. (#8891) (02/04/20) - Fixes several typos and clarifies some explanations in MySQL doc. (#8908) (02/03/20) - usage: Fix buckets count calculation when no object is present (#8929) (02/04/20) - Avoid select inside a recursive function to avoid CPU spikes (#8923) (02/03/20) - fix: Avoid re-reading bucket names from etcd (#8924) (02/03/20) - fix a crash in base64 buffer pool (#8925) (02/03/20) - NAS gateway: fix notification initialization (#8920) (02/02/20) - fix: multi-delete API write quorum failures (#8926) (02/01/20) - Use user CAs in checkEndpoint() call (#8911) (02/02/20) - Initialize only one retry timer for all sub-systems (#8913) (02/02/20) - Fix panic in ServerInfoHandler when (#8915) (02/01/20) - trace - log request body (#8917) (02/01/20) - fix: remove response header timeout (#8919) (02/01/20) - jwt: Simplify JWT parsing (#8802) (01/31/20) - Fix recursive deep scan of buckets (#8900) (01/30/20) - Fix Retention, ObjectLock, LegalHold struct namespaces correctly. (#8909) (01/30/20) - Add CreateBucketError, ListMultipartUploads functional test (#8886) (01/29/20) - heal: Optimize heal listing by avoiding batches (#8901) (01/29/20) - Set default namespace for necessary structs (#8903) (01/29/20) - doc: match code on sysctl -w vm.swappiness=1 (#8894) (01/27/20) - Rename pkg/{tagging,lifecycle} to pkg/bucket sub-directory (#8892) (01/27/20) - test: print more relevant info in healing failure (#8895) (01/27/20) - Make admin permissions more granular for admin handlers. (#8888) (01/26/20)