Try to remove assumption that zone's root vnode is marked VROOT

@@ -728,10 +728,11 @@
          * its pseudonode.
          * Note - for VROOT exports the implicitly allowed flavors were
          * transferred from the PSEUDO export in exportfs()
          */
         if (isadd && !(exip->exi_vp->v_flag & VROOT) &&
+            !VN_IS_CURZONEROOT(exip->exi_vp) &&
             tnode->tree_vis->vis_seccnt > 0) {
                 srv_secinfo_add(&exip->exi_export.ex_secinfo,
                     &exip->exi_export.ex_seccnt, tnode->tree_vis->vis_secinfo,
                     tnode->tree_vis->vis_seccnt, FALSE);
         }

@@ -2074,11 +2075,11 @@
                 /*
                  * We have just failed finding a matching export.
                  * If we're at the root of this filesystem, then
                  * it's time to stop (with failure).
                  */
-                if (vp->v_flag & VROOT) {
+                if ((vp->v_flag & VROOT) || VN_IS_CURZONEROOT(vp)) {
                         error = EINVAL;
                         break;
                 }
 
                 if (walk != NULL)