relocate repo files so ND2 is the only code

lib/App/Netdisco/DB/schema_versions/App-Netdisco-DB-38-39-PostgreSQL.sql

@@ -0,0 +1,15 @@
+-- clean up node table where vlan = 0 and vlan = <another number>
+-- 
+-- DELETE n1.*
+--   FROM node n1 INNER JOIN
+--     (SELECT mac, switch, port from node
+--       GROUP BY mac, switch, port
+--       HAVING count(*) > 1) n2
+--     ON n1.mac = n2.mac
+--       AND n1.switch = n2.switch
+--       AND n1.port = n2.port
+--       AND n1.vlan = '0';
+
+BEGIN;
+
+COMMIT;