Stiopa Koltsov 138bf01c15 What is the reason webpki operation failed? ...

I don't know if it's me or everyone, but debugging TLS setup issues
is usually non-trivial.

For example, right now I'm fighting with this issue:
an `openssl s_client` works fine, but a client implemented with
rustls fails with an error:

```
Custom { kind: InvalidData, error: WebPKIError(UnknownIssuer) }
```

`WebPKIError` can be emitted for several reasons. This PR adds the
operation name to the error. I have identified five operations:
* validate server certificate
* validate client certificate
* validate certificate for DNS name
* parse the certificate
* verify message signature

The error can be expanded further later, but even this basic list
will provide some clue where to look.

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..

common

cargo fmt

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badssl.rs

What is the reason webpki operation failed?

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bugs.rs

rustfmt remaining rustls-mio tests

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client_suites.rs

rustfmt remaining rustls-mio tests

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curves.rs

rustfmt remaining rustls-mio tests

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errors.rs

rustfmt remaining rustls-mio tests

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features.rs

rustfmt remaining rustls-mio tests

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server_suites.rs

rustfmt remaining rustls-mio tests

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topsites.rs

rustfmt remaining rustls-mio tests

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