Fix NFS design problems re. multiple zone keys
Make NFS server zone-specific data all have the same lifetime
Fix rfs4_clean_state_exi
Fix exi_cache_reclaim
Fix mistakes in zone keys work
More fixes re. exi_zoneid and exi_tree
(danmcd -> Keep some ASSERT()s around for readability.)

*** 750,760 ****
          rfs4_bucket_t *buckets, *bp;
          rfs4_link_t *l;
          rfs4_client_t *cp;
          int i;
  
!         nfs4_srv_t *nsrv4 = zone_getspecific(rfs4_zone_key, curzone);
          rfs4_table_t *table = nsrv4->rfs4_client_tab;
  
          /*
           * We get called for Suspend and Resume events.
           * For the suspend case we simply don't care!  Nor do we care if
--- 750,760 ----
          rfs4_bucket_t *buckets, *bp;
          rfs4_link_t *l;
          rfs4_client_t *cp;
          int i;
  
!         nfs4_srv_t *nsrv4 = nfs4_get_srv();
          rfs4_table_t *table = nsrv4->rfs4_client_tab;
  
          /*
           * We get called for Suspend and Resume events.
           * For the suspend case we simply don't care!  Nor do we care if