Added a logging message in log recover process.

From: Jie Yu <yujie.jay@gmail.com>
Review: https://reviews.apache.org/r/17202
Added a test that verifies a non-voting replica does not reply to
promise/write requests.

From: Jie Yu <yujie.jay@gmail.com>
Review: https://reviews.apache.org/r/17203
Removed --without-curl from libprocess configuration.

From: Timothy St. Clair <tstclair@redhat.com>
Review: https://reviews.apache.org/r/17130