Duplicate custom partitioning tests for blivet-gui
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Now we have *two* custom partitioning interfaces in the installer (the regular anaconda one, and the one that runs blivet-gui), we should really duplicate all the custom partitioning tests to do the same thing in blivet-gui.

@jsedlak foolishly^H^H^H^H^H^H^H^H^Hheroically volunteered to do this, so assigning to him ;)

We should probably also adapt the wiki matrices here somehow, I'll send out a proposal for that.