Append script to create ZFS swap volume #22
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When using the default PVE GUI Installer and selecting ZFS for the root fs, the installer will not create any swap.
Since this script offers to configure swappiness, we might want to create some swap before.
This PR will ask the user interactively how big the swap volume should be and how it shall be named. It then creates a zfs volume/dataset with the name and the given size (rounded to full blocks), formats it as swap, enables it immediately and adds it to fstab so swap will be loaded each time the server boots.
When creating the zfs volume, the option
com.sun:auto-snapshot=falseis set to prevent the swap volume being snapshotted by zfs-auto-snapshots, which is also being installed by this script.