DoFunc (Support for aws sign)

[m-hosoi]

Usage:

import (
  ...
  v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
)
...

// signature expired
// resp, err := client.Do(...)

resp, err := client.DoFunc(func()(*retryablehttp.Request, error) {
  req, err := http.NewRequestWithContext(...)
  signer := v4.NewSigner(...)
  signer.Sign(ctx, req, ...)
  return retryablehttp.FromRequest(req)
})

[hashicorp-cla]

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