test: Print verbosely on failures in verbose mode
test: Print verbosely on failures in verbose mode

Update the test runner to print detail about why the test failed when it
fails, if the runner is running in verbose mode.

NXPmicro/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls