MinIO: Bug Fix Release

## Highlights - Rolling upgrade is not supported in this release, due to changes in StorageAPI. See (#7932) for more details. - Regeression fix for deployments running in erasure mode and encrypted multi-part putobject API. In very rare cases due to a race condition, some parts might end up being stored unencrypted on the backend. Users are advised to upgrade immediately. Please see (#8241) for more details. - Major performance improvements to S3 select upto 14x. See (#8238 and #8261) for more details. - Regression fix in etcd watch in IAM subsystem. See (#8224) for more details. - Regression fix in listobjects on Ubuntu 14.04 with XFS. See (#8240) for more details. - Fix auto-healing crash for very large number of objects. See (#8239) for more details. ## Changelog - Add rootCAs support to Kafka & MQTT (#8236) (09/18/19) - Add notes on configuring LDAP STS with Microsoft Active Directory (#8260) (09/17/19) - S3 Select: Parsing tweaks (#8261) (09/17/19) - In HDFS gateway fix non-empty folder behavior (#8254) (09/18/19) - Update comments in ldap example client code (#8257) (09/18/19) - Remove size query parameter from PerfInfo handler (#8258) (09/18/19) - fs/xl: Log warning if cache config specified (#8251) (09/16/19) - Avoid recursion and use a simple loop to merge entries (#8239) (09/17/19) - Build staticcheck as pre-built binaries are not available for s390x (#8220) (09/17/19) - S3 Select: optimize output (#8238) (09/17/19) - Wait clearing the close channel (#8250) (09/16/19) - posix/readDir should populate name for DT_UKNOWN (#8240) (09/17/19) - return error during part listing when no quorum (#8241) (09/17/19) - Allow caching only in gateway mode. (#8232) (09/17/19) - Update Kafka notification example doc (#8212) (09/16/19) - Remove unusued Set/GetConfigKeys API (#8235) (09/13/19) - Concurrent CSV parsing and reduce S3 select allocations (#8200) (09/13/19) - Use optimized sha256-simd whenever possible (#8227) (09/14/19) - Handle connection failures on webhook/url pings (#8204) (09/12/19) - Honor standard HTTP headers for sourceIP (#8233) (09/13/19) - Add ability to test drive speeds on a MinIO setup (#7664) (09/13/19) - xl: Fix verifying non streaming highway algo with a dist setup (#8230) (09/12/19) - Provide a friendlier error when an update fails (#8228) (09/13/19) - Hosts should be skipped, when calculating local info (#8191) (09/12/19) - Use the B2 'list' endpoint to determine file ID (#8169) (09/12/19) - Fix etcd watch regression in IAM subsystem (#8224) (09/12/19) - Fix go mod tidy errors and fix platform independent downloads (#8222) (09/12/19) - Remove maintainers.md use only contributing.md (#8215) (09/12/19) - bitrot: Verify file size inside storage interface (#7932) (09/12/19)