[PATCH 1 of 3] httppeer: don't send empty Vary request header

[Yuya Nishihara]

On Sun, 16 Apr 2017 11:58:07 -0700, Gregory Szorc wrote:
> # HG changeset patch
> # User Gregory Szorc <gregory.szorc at gmail.com>
> # Date 1492367282 25200
> #      Sun Apr 16 11:28:02 2017 -0700
> # Node ID 512298a07c26d7dfeb75ca4b427352e2af9d62d7
> # Parent  25146c0366d4f497be856a35c078ede207bbee87
> httppeer: don't send empty Vary request header

Queued these, thanks.