Updates an ftp user.
$session_id, $client_id, $primary_id, $params
Parameters (in $params):server_id (int(11))
parent_domain_id (int(11))
username (varchar(64))
password (varchar(64))
quota_size (bigint(20))
active (enum('n','y'))
uid (varchar(64))
gid (varchar(64))
dir (varchar(255))
quota_files (bigint(20))
ul_ratio (int(11))
dl_ratio (int(11))
ul_bandwidth (int(11))
dl_bandwidth (int(11))
Output:Returns the number of affected rows.