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Import George Wilson's change for Illumos #4730: 4730 metaslab group taskq should be destroyed in metaslab_group_destroy() Reviewed by: Alex Reece <alex.reece@delphix.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Sebastien Roy <sebastien.roy@delphix.com> Original author: George Wilson