add support for drive speedtest

[wlan0]

Need to merge dperf and madmin-go before merging this

[wlan0]

@harshavardhana I've updated the PR after madmin-go and dperf merges. It is ready for review/merge

[harshavardhana]

@wlan0 PTAL at linter errors

Error: cmd/notification.go:1614:1: exported: comment on exported method NotificationSys.DriveSpeedTest should be of the form "DriveSpeedTest ..." (revive)
// driveSpeedTest - Drive performance information
^

[harshavardhana]

@wlan0 can you fix linter errors?

Running lint check
Error: cmd/notification.go:1614:1: exported: comment on exported method NotificationSys.DriveSpeedTest should be of the form "DriveSpeedTest ..." (revive)
// driveSpeedTest - Drive performance information
^
make: *** [Makefile:37: lint] Error 1
Error: Process completed with exit code 2.

[harshavardhana]

@wlan0 you would have to run

cmd/notification.go:1636: File is not gofumpt-ed (gofumpt)

https://github.com/mvdan/gofumpt

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-fs.sh	✔️
mint-gateway-s3.sh	✔️
mint-erasure.sh	✔️
mint-dist-erasure.sh	✔️
mint-gateway-nas.sh	✔️
mint-compress-encrypt-dist-erasure.sh	✔️
mint-pools.sh	✔️
Deleting image on docker hub
Deleting image locally