[packagekit] [PATCH 3 of 4] Add progress reporting to pisi backend

[Matthias Klumpp]

Hi!
Without knowing the Pisi backend, your patches look okay in general.
It might make sense to use the PackageKit GIR interface in some places
instead of python-packagekit, but since I never wrote a Python PK
backend, I don't have much experience here (I'll leave this up to
Richard to comment :P).
Do you plan to maintain the Pisi backend in future?
Cheers,
    Matthias
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