The metadata are collected in the constructor and are saved in the
meta variable. This way they can be accessed and altered by the
sysprep methods. There are cases where some metadata are not valid
and need to be updated after a sysprep action is performed. For
example, remove_user_accounts sysprep action may remove a user that
is present in the USERS metadata.

The metadata passed by the user will overwrite any automatically
collected metadata with the same key.

This action will remove the swap entry from the fstab.

If the swap partition is the last partition in the media, then it can
be safely removed. The image-creator will save enough info in the
SWAP metadata to recreate it.

This is needed because otherwise setup.py fails on some systems. Also
do some more cleanup.

Not all needed code parts where updated when the size() method in
DiskDevice class was abandoned in favor of the size attribute.

Also rearrange input options

This is just a template. Not fully workable

Also merge data_cleanup tasks with syspreps and did a major cleanup

Add --print-data-cleanup and --print sysprep input options. If enabled
the program will output what data cleanup and syspep operations will
and won't run a a selected input media

This method will remove all users that have id over 1000. In most
systems this will remove all normal user accounts besides the first
one. This method will not run by default.

This can be used to create a set of by default disabled data_cleanup
and sysprep tasks.

All printing had to be reordered and now it is done from a central point.

Commit 3f70f242 introduced a bug where the event file was overwritten
instead of the action file.

This commit fixes a bug where size method in DiskDevice returned the
payload size of the device one byte shorter than it actually was.