Sylistic improvements for configuration

- Make configuration structures named, not anonymous
- Use named local variable when configuration/boostrap structures are
  used often.

This avoids 100-column lines where the bulk is just referencing the
various identifiers.

Change-Id: I65bb20aacca9c4f3cff2a01b5d42484f49bee0d8
Reviewed-on: http://review.couchbase.org/30871
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>