[PATCHES] replmd: fix for linked attribute replacement with related tests

[Douglas Bagnall]

As Björn found in https://bugzilla.samba.org/show_bug.cgi?id=13095, the
linked attribute changes in 4.7 allow you to introduce duplicate links
using MOD_REPLACE. This is not good.

Here we fix that and test for it.

As well as the fix itself, we find that some of the linked attribute
tests had flawed logic that would have allowed other failures.

Please review and push!

Douglas

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