Move admin0 server functions around

- move files to its right place
- add some boilerplate for test setup
- add tests

server/extension/sql/00_install_test.sql

@@ -8,3 +8,14 @@ CREATE EXTENSION cdb_geocoder;
 -- Install the extension
 CREATE EXTENSION cdb_geocoder_server;
 
+-- Mock the varnish invalidation function
+-- (used by cdb_geocoder tests)
+CREATE OR REPLACE FUNCTION public.cdb_invalidate_varnish(table_name text) RETURNS void AS $$
+BEGIN
+  RETURN;
+END
+$$
+LANGUAGE plpgsql;
+
+-- Set user quota
+SELECT cartodb.CDB_SetUserQuotaInBytes(0);