Set search path before installing/update the extension

See #324

client/sql/00_header.sql

@@ -1,3 +1,6 @@
 --DO NOT MODIFY THIS FILE, IT IS GENERATED AUTOMATICALLY FROM SOURCES
 -- Complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "CREATE EXTENSION cdb_dataservices_client" to load this file. \quit
+
+-- Make sure we have a sane search path to create/update the extension
+SET search_path = "$user",public,cdb_dataservices_client;

client/upgrade_downgrade_template.erb

@@ -2,4 +2,7 @@
 -- Complain if script is sourced in psql, rather than via CREATE EXTENSION
 \echo Use "ALTER EXTENSION cdb_dataservices_client UPDATE TO '<%= version %>'" to load this file. \quit
 
+-- Make sure we have a sane search path to create/update the extension
+SET search_path = "$user",public,cdb_dataservices_client;
+
 -- HERE goes your code to upgrade/downgrade