libweave: Extracted interaction with libwebserv into WebServClient

Class implements weave::HttpServer using libwebserv and it's going to be
moved out of libweave.

BUG=brillo:1252
TEST='FEATURES=test emerge-gizmo buffet'

Change-Id: I069831d50e39478c281073a62ad81ef63f3065a6
Reviewed-on: https://chromium-review.googlesource.com/290141
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Trybot-Ready: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
6 files changed
tree: 261120b31d02922e2ae45eb94c60989a12fc3020
  1. buffet/
  2. libweave/