Krishna Srinivas 7d19ab9f62 readiness returns error quickly if any of the set is down (#9662) ...

This PR adds a new configuration parameter which allows readiness
check to respond within 10secs, this can be reduced to a lower value
if necessary using 

```
mc admin config set api ready_deadline=5s
```

 or

```
export MINIO_API_READY_DEADLINE=5s
```

2020-05-23 17:38:39 -07:00

..

api.go

readiness returns error quickly if any of the set is down (#9662)

2020-05-23 17:38:39 -07:00

help.go

readiness returns error quickly if any of the set is down (#9662)

2020-05-23 17:38:39 -07:00