MB-5988: better error message if sqlite3 missing
MB-5988: better error message if sqlite3 missing

Change-Id: I103b145f652aab7f12472897e51e35bb4970d4d7
Reviewed-on: http://review.couchbase.org/18739
Reviewed-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

couchbaselabs/couchbase-cli,membase/membase-cli,couchbase/couchbase-cli,couchbaselabs/couchbase-cli,couchbaselabs/couchbase-cli,membase/membase-cli,couchbase/couchbase-cli,membase/membase-cli