relocate repo files so ND2 is the only code

lib/App/Netdisco/DB/schema_versions/App-Netdisco-DB-40-41-PostgreSQL.sql

@@ -0,0 +1,7 @@
+BEGIN;
+
+ALTER TABLE community RENAME COLUMN snmp_auth_tag TO snmp_auth_tag_read;
+
+ALTER TABLE community ADD COLUMN snmp_auth_tag_write text;
+
+COMMIT;