Require verification for 20% of new accounts (#521)

service/person/sql/__init__.py

@@ -487,7 +487,7 @@
         ) AS unit_id,
         3 AS intros_notification,
         CASE
-            WHEN RANDOM() < 0.9 THEN 1
+            WHEN RANDOM() < 0.8 THEN 1
             ELSE 3
         END AS privacy_verification_level_id
     FROM onboardee