Do not limit swap to 128 GiB
Do not limit swap to 128 GiB

The limit was part of change to limit suggested swap size in
kickstart which doesn't use the SwapSpace._max_size so there is no
reason to limit this for manual installations.
16 TiB seems to be max usable swap size based on mkswap code.

Resolves: rhbz#1656485

vojtechtrefny/blivet,jkonecny12/blivet,vojtechtrefny/blivet,rvykydal/blivet,rvykydal/blivet,jkonecny12/blivet