Launch appropriate QEMU based on input image

The openbmc servers will use the new QEMU binary and
require different parameters then the default QEMU
image.

This commit gets the end to end function of being able
to run the qemu regression against systems like witherspoon,
romulus, and palmetto while also keeping the legacy support
in.

Resolves openbmc/openbmc#2272

Change-Id: I2bcd10752e5e20fe0546e674335cff46618b2d82
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
2 files changed