Revert exi_zone to exi_zoneid, and install exi_ne backpointer
NFS Auth per-zone needs better cleanup
curzone reality check and teardown changes to use the RIGHT zone

@@ -279,10 +279,13 @@
 
         list_destroy(&nag->refreshq_queue);
         cv_destroy(&nag->refreshq_cv);
         mutex_destroy(&nag->refreshq_lock);
         mutex_destroy(&nag->mountd_lock);
+        /* Extra cleanup. */
+        if (nag->mountd_dh != NULL)
+                door_ki_rele(nag->mountd_dh);
         kmem_free(nag, sizeof (*nag));
 }
 
 /*
  * Convert the address in a netbuf to

@@ -873,10 +876,11 @@
 
         avl_index_t             where;  /* used for avl_find()/avl_insert() */
 
         ASSERT(cr != NULL);
 
+        ASSERT3P(curzone->zone_id, ==, exi->exi_zoneid);
         nag = nfsauth_get_zg();
 
         /*
          * Now check whether this client already
          * has an entry for this flavor in the cache