relocate repo files so ND2 is the only code

lib/App/Netdisco/DB/schema_versions/App-Netdisco-DB-17-18-PostgreSQL.sql

@@ -0,0 +1,7 @@
+BEGIN;
+
+ALTER TABLE admin DROP CONSTRAINT IF EXISTS admin_pkey;
+
+ALTER TABLE admin ADD PRIMARY KEY (job);
+
+COMMIT;