Checkmk Werk 8808: zfsget: readd fallback for very old zfs pool versions

ID: 8808 Title: zfsget: readd fallback for very old zfs pool versions Component: Checks & agents Level: 1 Class: Bug fix Version: 1.7.0i1 Some used options of the zfs query have been introduced later in the development. Although all used options are available with all pools created with solaris 11 and later, this fix brings the fallback for older pools back to life.