Refactor timeout semantics

Timeouts are scheduled automatically by the connection subsystem, with
the user logic controlling the specific "delaying" of the timeouts.

Change-Id: Ie125c3584f54700d830a8732a5b8a5fe481518c2
Reviewed-on: http://review.couchbase.org/27779
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Provide setting for default non-views HTTP timeout

Change-Id: I3e9e2f4d2f1ebbe3eef77b8f333cd565792893bc
Reviewed-on: http://review.couchbase.org/27879
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>