Slots in HSM are not assigned statically, we have to chose proper
slot from token label.
Softhsm i2.2.0 changed this behavior and now slots can change over
time (it is allowed by pkcs11 standard).
Changelog:
* created method get_slot() that returns slot number from
used label
* replaces usage of slot in __init__ method of P11_Helper
with label
* slot is dynamically detected from token label before
session is opened
* pkcs11-util --init-token now uses '--free' instead '--slot'
which uses first free slot (we don't care about slot numbers
anymore)
https://pagure.io/freeipa/issue/6692
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>