rng: GenerateRandom* test for ROUserSessionTest.
rng: GenerateRandom* test for ROUserSessionTest.

There exist devices that require login for GenerateRandom,
so duplicate the existing GenerateRandom* tests for a logged
in fixture.

Yubico/pkcs11test,Yubico/pkcs11test,Yubico/pkcs11test,Yubico/pkcs11test