Moves all the testsdk code from testimage in order to have it's own
class because new tests will be added for extensible SDK.
The old paths for store logs "${WORKDIR}/testimage" and sdk
"${WORKDIR}/testimage-sdk" was maintained for compatibility may be
change to point testsdk after review the codebase.
The dependency of QEMU was removed because isn't needed.
Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
