[Merge] ~cpete/ubuntu-dev-tools:update-python-launchpadlib into ubuntu-dev-tools:main

[Chris Peterson]

>How did you come to the conclusion we should be using AGPL here? Can't we just stick to the original license?

As discussed out of band, I had misunderstood both the licensing and our requirements. I have updated the copyright to be GPLv3 where possible and to retain the original licensing otherwise (i.e. new files in ubuntutools/tests/* are ISC since this is how it was specified in debian/copyright).

Please let me know if this is acceptable or how I could improve it.

(Apologies if you get this twice, I thought I had hit send but on refresh my comment disappeared.)
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