[PATCH] Address regression in samba 4.5 dbcheck with deleted links

[Andrew Bartlett]

This patch makes dbcheck not complain about legitimate records in the
database that have been exposed by changes in dbcheck with Samba 4.5.

We don't try to keep the string form of deleted links up to date.

This patch addresses that and adds some tests.

Please review/push.

Andrew Bartlett
-- 
Andrew Bartlett
https://samba.org/~abartlet/
Authentication Developer, Samba Team         https://samba.org
Samba Development and Support, Catalyst IT   
https://catalyst.net.nz/services/samba



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