RFE: Use progressbar2

[timlnx]

Copied from Ankur Sinha (FranciscoD) on bugzilla https://bugzilla.redhat.com/show_bug.cgi?id=1654747

python-progressbar2 is a much better maintained, more featured fork of progressbar which
had gone inactive in the past. Would it please be possible to use this new one instead?
That way Fedora can provide a single progressbar package instead of two that conflict (they
both provide the progressbar module).

Please see: https://bugzilla.redhat.com/show_bug.cgi?id=1218533 

https://github.com/WoLpH/python-progressbar

This might be a longer-term goal. Will have to check the API compatibility of the two progress bar modules.

[timlnx]

For this we will be removing integrations from the code base and including them as full source code examples online and in the repository. See the main "2.0 is coming" bug #99 for more info