Judge if "SanityCheck" event is received, it will issue the
sanity_check() and send "SanityCheckPassed" back if succeeded.
(From OE-Core rev: 19704f9e69ecf09531687385b478b47f49fe372d)
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>