Fix behavior of __getkey
Fix behavior of __getkey

On __getkey, the behavior should be to integrate a signature if found, but
skip the request if not found.  Currently it skips both.

Signed-off-by: Dave Heller <dadf76b92c028da3488e57973c6c8cd3d5ab990c@us.ibm.com>

hellerda/sb-signing-utils,hellerda/sb-signing-utils