In Fedora 33, we generally no longer include a disk-based swap
partition by default (instead swap-on-ZRAM is used, see
https://fedoraproject.org/wiki/Changes/SwapOnZRAM ). This tweaks
our tests to account for that. In tests that aren't to do with
swap at all, we stop including a swap partition in order to be
closer to the default layout. We replace the old _no_swap blivet
and custom tests with _with_swap tests that, as the name implies,
*explicitly include* a swap partition, and adjust the postinstall
test to check the disk swap partition is there.
Signed-off-by: Adam Williamson <awilliam@redhat.com>