CLI interface to AdjustUpgrade.pm

I have in hand a little project I have mentioned elsewhere, to convert
the Buildfarm client to Python. It's well underway, but one blocker is
the cross version upgrade module's use of AdjustUpgrade.pm. The best way
around that I can think of is to provide a CLI interface to the module,
along the lines of the attached small script, which I would propose to
backpatch to all the live branches.

cheers

andrew

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Andrew Dunstan
EDB: https://www.enterprisedb.com