CCBC-529: Return error when conflicting options are found

Change-Id: I1bf63308d7ab157eebc1d48a332a8f869b81eda4
Reviewed-on: http://review.couchbase.org/42356
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>