better postgresql support for custom schema on web

Author: Anthony Somerset

templates/web/zabbix.conf.php.erb

@@ -15,8 +15,12 @@ $DB['DATABASE'] = '<%= @database_name %>';
 $DB['USER']     = '<%= @database_user %>';
 $DB['PASSWORD'] = '<%= @database_password %>';
 
-// SCHEMA is relevant only for IBM_DB2 database
+// SCHEMA is relevant only for IBM_DB2 and PostgreSQL database
+<% if @database_schema -%>
+$DB['SCHEMA'] = '<%= @database_schema %>';
+<% else -%>
 $DB['SCHEMA'] = '';
+<% end -%>
 
 $ZBX_SERVER      = '<%= @zabbix_server %>';
 $ZBX_SERVER_PORT = '<%= @zabbix_listenport %>';