image: Convert vmdk/vdi/qcow2 to strict CONVERSION_CMD types
The vmdk/vdi/qcow2 IMAGE_FSTYPEs predate wic. As such, they provide
some similar underlying functionality in order to produce a "disk" image
that in turn can be converted into different formats that various
hypervisor types work with. They do not however provide the ability for
other disk image types to be converted into these same output types.
Furthermore, they are less flexible than what wic does provide. This
drops the old style vmdk/vdi/qcow2 types and re-introduces them under
the CONVERSION_CMD framework. The equivalent of vmdk is now wic.vmdk
and so forth for the other types.
Signed-off-by: Tom Rini <trini@konsulko.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
