Deactivate findExistingInstallations.

This requires some monkey patching again and disabling this is crucial in NixOS,
as we have a "quite" different FHS layout than Fedora oder RHEL.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Fix PEP-8 blank lines (E302).

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Add -v/--verbose flag to print commands.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>