libnet/drs: Update replication debug to report link progress

libnet/drs: Update replication debug to report link progress

Update the replication debug (for joins/backups) so that it's easier to
see how far through syncing the links we are. E.g. with 150,000 links,
you just get screeds of debug like this, with no real idea how far
through the replication is.

Partition[DC=addom,DC=samba,DC=example,DC=com] objects[11816/11720]
linked_values[1500/150024]
Partition[DC=addom,DC=samba,DC=example,DC=com] objects[11816/11720]
linked_values[1500/150024]
Partition[DC=addom,DC=samba,DC=example,DC=com] objects[11816/11720]
linked_values[1500/150024]

This patch now applies to links the same debug logic we use for objects,
and changes it to look like:

Partition[DC=addom,DC=samba,DC=example,DC=com] objects[11816/11720]
linked_values[57024/150024]
Partition[DC=addom,DC=samba,DC=example,DC=com] objects[11816/11720]
linked_values[58524/150024]
Partition[DC=addom,DC=samba,DC=example,DC=com] objects[11816/11720]
linked_values[60024/150024]

Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>