This import was at level of OESDKTestContext.register_commands
but OESDKTestContext.run method need it to raise exceptions.
(From OE-Core rev: 35efb419de1dbebd269d87895645934707130746)
Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>