Separate out individual steps of creating a checkpoint from
qemuCheckpointCreateXML into separate functions. This makes the function
more readable and understandable and also some of the new functions will
be reusable when we will be creating a checkpoint along with a backup
in the upcoming patches.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>