crimson/os/seastore/onode_manager: populate value recorders of onodes to

crimson/os/seastore/onode_manager: populate value recorders of onodes to
be erased

Otherwise, the following modification sequence with the same transaction
might lead to onode extents' crc inconsistency during journal replay:

1. modify the last mapping in an onode extent;
2. erase the last mapping in that onode extent.

During journal replay, if the first modification is not recorded in the
delta, the onode extent's content would be inconsistent with that before
the system reboot

Signed-off-by: Xuehan Xu <xuxuehan@qianxin.com>