Martin Pool 44dd7746ed Test both new samba.tdbpack and oldtdbutil pack/unpack routines. ...

This makes the test suite fail because at the moment they are in fact
not behaving the same way.

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oldtdbutil.py

Import old pure Python version of tdbpack/unpack, so that we can do

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tdbtimetrial.py

Check in examples for tdb packer

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test_tdbpack.py

Test both new samba.tdbpack and oldtdbutil pack/unpack routines.

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