split levenshtein/dfa addUtf8Sequences() into helper
split levenshtein/dfa addUtf8Sequences() into helper

Change-Id: I64cc079c654d2148fc15ff493bacef7069bb1d81
Reviewed-on: http://review.couchbase.org/96972
Well-Formed: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Reviewed-by: Abhinav Dangeti <d73ef2279de6577f7bf081737ee47554bbb7dc82@couchbase.com>

couchbase/vellum