Harshavardhana e9055e9ef7 fix: walk() should cancel itself upon context cancellation (#15553) ...

This PR fixes possible leaks that may emanate from not
listening on context cancelation or timeouts.

```
goroutine 60957610 [chan send, 16 minutes]:
github.com/minio/minio/cmd.(*erasureServerPools).Walk.func1.1.1(...)
        github.com/minio/minio/cmd/erasure-server-pool.go:1724 +0x368
github.com/minio/minio/cmd.listPathRaw({0x4a9a740, 0xc0666dffc0},...
        github.com/minio/minio/cmd/metacache-set.go:1022 +0xfc4
github.com/minio/minio/cmd.(*erasureServerPools).Walk.func1.1()
        github.com/minio/minio/cmd/erasure-server-pool.go:1764 +0x528
created by github.com/minio/minio/cmd.(*erasureServerPools).Walk.func1
        github.com/minio/minio/cmd/erasure-server-pool.go:1697 +0x1b7
```

2022-08-18 17:49:08 -07:00

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