nebraska: Log request and responses in more places

Log both request and response (wasn't being done) for both use cases of
running nebraska as a server and using it as a library.

BUG=chromium:920404
TEST=sudo ./nebraska.py --port=10000
Then:
  curl -X POST -d@request.xml http://localhost:10000/
included the request and response in the log.

Change-Id: I7448d41aa8d35a94f61ef45b6aef5f16375ce7c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/1709910
Tested-by: Amin Hassani <ahassani@chromium.org>
Auto-Submit: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Nicolas Norvez <norvez@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
1 file changed