[release-branch.go1.11] crypto/tls: make ConnectionState.ExportKeyingMaterial a method

The unexported field is hidden from reflect based marshalers, which
would break otherwise. Also, make it return an error, as there are
multiple reasons it might fail.

Fixes #27131

Change-Id: I92adade2fe456103d2d5c0315629ca0256953764
Reviewed-on: https://go-review.googlesource.com/130535
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit 240cb4c75fbe969364edb1a7f7ebd2d827831d34)
Reviewed-on: https://go-review.googlesource.com/130655
13 files changed
tree: 74644f3a9d4afada906733e823f327470a98c8ac
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. VERSION
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