Add extract-cert wrapping helper functions, to easily extract
certificates again that had been previously imported into the softhsm.
Reviewed-by: Jan Luebbe <jlu@pengutronix.de>
Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>