p11tool: fix admin user PIN initialization
Previously we would call gnutls_pkcs11_token_set_pin() without an old PIN provided, which will result to the use of C_InitPIN() on the underlying module. The C_InitPIN() in contrast with C_SetPIN() will only work for the user and not for the administrator. As such, we always provide the oldpin for when we change the admin's PIN.
Checklist
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Code modified for feature -
Test suite updated with functionality tests -
Documentation updated
Reviewer's checklist:
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Any issues marked for closing are addressed -
There is a test suite reasonably covering new functionality or modifications -
Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTION.md
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This feature/change has adequate documentation added -
No obvious mistakes in the code
Edited by Nikos Mavrogiannopoulos