app/crypto-perf: display results in test runner

Instead of printing the test results in the destructor
function, print them just after each run.
This will be useful for after the commit that allows
a range of buffer and burst sizes.

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
Acked-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>