- Remove get_pending_ranges and introduce has_pending_ranges, since the
caller only needs to know if there is a pending range for the keyspace
and the node.
- Remove print_pending_ranges which is only used in logging. If we
really want to log the new pending token ranges, we can log when we
set the new pending token ranges.
This removal of _pending_ranges makes copying of token_metadata faster
and reduces the chance to cause reactor stall.
Refs: #7220