MB-12314: Report error for incorrect command line options

Change-Id: Ie96920c9909af941bf0b0ac59fc35eac8232091b
Reviewed-on: http://review.couchbase.org/42001
Reviewed-by: Dave Rigby <daver@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>