code: def atlas_peer_has_zonefile( peer_hostport, zonefile_hash, zonefile_bits=None, con=None, path=None, peer_table=None ):
      
  
      bits = None
      if zonefile_bits is None:
          bits = atlasdb_get_zonefile_bits( zonefile_hash, con=con, path=path )
          if len(bits) == 0:
              return None
  
      else:
          bits = zonefile_bits
  
      zonefile_inv = None
  
      with AtlasPeerTableLocked(peer_table) as ptbl:
          if peer_hostport not in ptbl.keys():
              return False
  
          zonefile_inv = atlas_peer_get_zonefile_inventory( peer_hostport, peer_table=ptbl )
      
      res = atlas_inventory_test_zonefile_bits( zonefile_inv, bits )
      return res
docs: Does the given peer have the given zonefile defined?
      Check its inventory vector
  
      Return True if present
      Return False if not present
      Return None if we don't know about the zonefile ourselves, or if we don't know about the peer