MinIO: Bug Fix Release

## Highlights - Click [here](https://min.io/download) to download the latest version of MinIO. - Click [here](https://min.io/pricing) for production support. - Multiple performance improvements for small files in #11892 #11878 #11880 #11856 #11805 #11832 #11880 - Allow JSON validation issue in PostPolicy #11902 - LDAP group policy handling #11887 #11891 #11855 #11840 ## Changelog - do not call LocalStorageInfo on gateways (#11903) (03/25/21) (Harshavardhana) - fix: reject duplicate keys in PostPolicyJSON document (#11902) (03/25/21) (Harshavardhana) - fix error could not read /proc ion windows. (#11868) (03/25/21) (Klaus Post) - highwayhash: update to latest version containing an arm64 fix (#11901) (03/25/21) (Andreas Auernhammer) - Converge PolicyDBGet functions in IAM (#11891) (03/25/21) (Aditya Manthramurthy) - xl: avoid sending Delete() remote call for fully successful runs (03/24/21) (Harshavardhana) - fix: LDAP policy application on user policy (#11887) (03/24/21) (Aditya Manthramurthy) - metrics: Add canceled requests (#11881) (03/24/21) (Klaus Post) - xl: add checks for minioTmpMetaBucket in CreateFile (03/24/21) (Harshavardhana) - xl: remove cleanupDir instead use Delete() (#11880) (03/24/21) (Harshavardhana) - metrics: Change type of minio_s3_requests_waiting_total to gauge (#11884) (03/24/21) (Anis Elleuch) - xl: CreateFile shouldn't prematurely timeout (#11878) (03/24/21) (Harshavardhana) - Revert "xl: CreateFile shouldn't prematurely timeout (#11854)" (03/23/21) (Harshavardhana) - simplify OS instrumentation remove functions for global variables (03/23/21) (Harshavardhana) - fix: optionally enable tracing posix calls (03/23/21) (Ritesh H Shukla) - fix: AccountInfo API for LDAP users (#11874) (03/23/21) (Aditya Manthramurthy) - fix: LDAP groups handling and group mapping (#11855) (03/23/21) (Harshavardhana) - avoid healObjects recursively healing at empty path (#11856) (03/23/21) (Harshavardhana) - xl: CreateFile shouldn't prematurely timeout (#11854) (03/22/21) (Harshavardhana) - fix: merge duplicate keys in post policy (#11843) (03/20/21) (Harshavardhana) - Add process uptime metric (#11844) (03/20/21) (Ritesh H Shukla) - crypto: simplify Context encoding (#11812) (03/20/21) (Andreas Auernhammer) - remove MINIO_IO_DEADLINE support (#11841) (03/20/21) (Harshavardhana) - fix: querying LDAP group/user policy (#11840) (03/20/21) (Aditya Manthramurthy) - xl: Reduce usage of isDirEmpty() (#11838) (03/19/21) (Anis Elleuch) - xl: Remove non needed check for empty dir (#11835) (03/19/21) (Anis Elleuch) - fix: sql cast function when converting to float (#11817) (03/19/21) (mailsmail) - Introduce metrics caching for performant metrics (#11831) (03/19/21) (Ritesh H Shukla) - lifecycle: Support old BucketLifecycleConfiguration tag (#11828) (03/19/21) (Anis Elleuch) - add missing java headless jdk in mint (03/18/21) (Harshavardhana) - fix: handle weird drives sporadic read O_DIRECT behavior (#11832) (03/18/21) (Harshavardhana) - fix: bucket / object count and size returned as 0 (#11825) (03/19/21) (Shireesh Anjal) - [feat] Add configurable deadline for writers (#11822) (03/18/21) (Harshavardhana) - Add main_test.go to run system tests with coverage (#11783) (03/18/21) (iternity-dotcom) - mrf: Enhance behavior for better results (#11788) (03/18/21) (Anis Elleuch) - No retries if minio server is down/connection refused err (#11809) (03/18/21) (ebozduman) - dsync: use refresh timer properly to avoid leaks (#11820) (03/17/21) (Harshavardhana) - allow configuring delete cleanup interval from default 10minutes (#11818) (03/17/21) (Harshavardhana) - storage write call path optimizations (#11805) (03/17/21) (Harshavardhana) - add additional metrics per disk API latency, API call counts #11250) (03/17/21) (Anis Elleuch)