5704 libzfs can only handle 255 filedescriptors

*** 99,108 ****
--- 99,109 ----
  dir path=opt/zfs-tests/tests/functional/inheritance
  dir path=opt/zfs-tests/tests/functional/interop
  dir path=opt/zfs-tests/tests/functional/inuse
  dir path=opt/zfs-tests/tests/functional/large_files
  dir path=opt/zfs-tests/tests/functional/largest_pool
+ dir path=opt/zfs-tests/tests/functional/libzfs
  dir path=opt/zfs-tests/tests/functional/link_count
  dir path=opt/zfs-tests/tests/functional/mdb
  dir path=opt/zfs-tests/tests/functional/migration
  dir path=opt/zfs-tests/tests/functional/mmap
  dir path=opt/zfs-tests/tests/functional/mount
*** 1773,1782 ****
--- 1774,1784 ----
  file path=opt/zfs-tests/tests/functional/large_files/setup mode=0555
  file path=opt/zfs-tests/tests/functional/largest_pool/largest_pool.cfg \
      mode=0555
  file path=opt/zfs-tests/tests/functional/largest_pool/largest_pool_001_pos \
      mode=0555
+ file path=opt/zfs-tests/tests/functional/libzfs/many_fds mode=0555
  file path=opt/zfs-tests/tests/functional/link_count/cleanup mode=0555
  file path=opt/zfs-tests/tests/functional/link_count/link_count_001 mode=0555
  file path=opt/zfs-tests/tests/functional/link_count/setup mode=0555
  file path=opt/zfs-tests/tests/functional/mdb/cleanup mode=0555
  file path=opt/zfs-tests/tests/functional/mdb/mdb_001_pos mode=0555