If we're implementing reset() in SignatureGenerator at all (and we need
to for a basic non-OE BitBake setup where that is the default signature
generator), then we need it to be clearing out the internal values
properly.
(Bitbake rev: 13f52d38fdbcb84c2a0c46f85baa44b22d53fdc1)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>