Looks like bc791e60e7 ("Update docs and test cases to work with
latest format versions") accidentally replaced 'qcow2' with
'qcow2-bios' for two of the output formats. Fix it.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
Adding a mkimage package to create dynamic 25GB VHD images (static
VHD images are already supported by LinuxKit).
Signed-off-by: Dave Freitag <dcfreita@us.ibm.com>