dbcheck: Add explict tests for unknown and unsorted attributeID values

dbcheck: Add explict tests for unknown and unsorted attributeID values

Unknown attributeID values would cause an exception previously, and
unsorted attributes cause a failure to replicate with Samba 4.2.

In commit 61b978872fe86906611f64430b2608f5e7ea7ad8 we started
to sort these values correctly, but previous versions of Samba
did not sort them correctly (we sorted high-bit-set values as
negative), and then after 9c9df40220234cba973e84b4985d90da1334a1d1
we stoped accepting these.

To ensure we are allowed to make this unusual change to the
replPropertyMetaData, a new OID is allocated and checked
for in repl_meta_data.c

BUG: https://bugzilla.samba.org/show_bug.cgi?id=10973

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>