Harshavardhana 123cccaed1 Honor connection pooling while tracing (#7979) ...

This PR fixes relying on r.Context().Done()
by setting

```
Connection: "close"
```

HTTP Header, this has detrimental issues for
client side connection pooling. Since this
header explicitly tells clients to turn-off
connection pooling. This causing pro-active
connections to be closed leaving many conn's
in TIME_WAIT state. This can be observed with
`mc admin trace -a` when running distributed
setup.

This PR also fixes tracing filtering issue
when bucket names have `minio` as prefixes,
trace was erroneously ignoring them.

2019-07-31 11:08:39 -07:00

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