bsdinstall guided partitioning should 4k-align swap and ufs partitions

[Mark Martinec]

> Btw (unrelated), tried the same with a 2 TB (virtual) disk, the
> guided partitioning suggested 64k boot, 2TB ufs, and 4GB swap,
> but then fails with "No free space left on device".
> Didn't investigate, looks like a bug.

Sorry, my mistake, please disregard this claim.
I chose "create" instead of "finish".

The rest of my posting (4k alignment) stands.

  Mark