Support using a common redis connection

If sentinel_host or sentinel_cluster_id is not provided it will try to
connect with a redis_host parameter

server/extension/test/0.5.0/sql/00_install_test.sql

@@ -0,0 +1,25 @@
+-- Install dependencies
+CREATE EXTENSION postgis;
+CREATE EXTENSION schema_triggers;
+CREATE EXTENSION plpythonu;
+CREATE EXTENSION cartodb;
+CREATE EXTENSION cdb_geocoder;
+
+-- Install the extension
+CREATE EXTENSION cdb_dataservices_server;
+
+-- Mock the redis server connection to point to this very test db
+SELECT cartodb.cdb_conf_setconf('redis_metrics_config', '{"sentinel_host": "localhost", "sentinel_port": 26379, "sentinel_master_id": "mymaster", "timeout": 0.1, "redis_db": 5}');
+SELECT cartodb.cdb_conf_setconf('redis_metadata_config', '{"sentinel_host": "localhost", "sentinel_port": 26379, "sentinel_master_id": "mymaster", "timeout": 0.1, "redis_db": 5}');
+
+-- 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);