 - Define mnt_startzero and mnt_endzero as a range that excludes mnt_mtx    and mnt_lock so that the mountpoint can be explicitly zeroed on    creation.
 - Define mnt_startzero and mnt_endzero as a range that excludes mnt_mtx
   and mnt_lock so that the mountpoint can be explicitly zeroed on
   creation.

Discussed with: tegge
Tested by:      kris
Sponsored by:   Isilon Systems, Inc.

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