log decoder header table in case of decode errors
log decoder header table in case of decode errors

Summary: we've got a really low number of sporadic decode errors after enabling HPACK in prod everywhere. Logging the decoder state might give a lot of hints of what's going on and we need in prod since the errors are sporadic and canaries won't catch them.

Test Plan: ran tests - the tests causing errors are spitting logs

Reviewed By: afrind@fb.com

Subscribers: trunkagent, doug, bmatheny, cgheorghe

FB internal diff: D1709826

Tasks: 5714696

Signature: t1:1709826:1417466834:0f407860671576ef87889dbc1a2763426a0cfe5c

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