message: Use where_v2 in lookup_ops to silence warnings
diff: @@ -1025,7 +1025,7 @@ class IdTableWithHashBuckets(LookupInterface):
  ids = self._table.lookup(values)
  buckets = math_ops.add(buckets, self._table.size())
  is_id_non_default = math_ops.not_equal(ids, self._table.default_value)
  - ids = array_ops.where(is_id_non_default, ids, buckets)
  + ids = array_ops.where_v2(is_id_non_default, ids, buckets)
  else:
  ids = buckets
  if isinstance(keys, sparse_tensor.SparseTensor):
  @@ -1199,7 +1199,7 @@ class StaticVocabularyTable(LookupInterface):
  ids = self._table.lookup(values)
  buckets = math_ops.add(buckets, self._table.size())
  is_id_non_default = math_ops.not_equal(ids, self._table.default_value)
  - ids = array_ops.where(is_id_non_default, ids, buckets)
  + ids = array_ops.where_v2(is_id_non_default, ids, buckets)
  else:
  ids = buckets
  if isinstance(keys, sparse_tensor.SparseTensor):
  