Provides information about available slots and tokens and enables the
selection of the slot to use.
The methods getSlotList and getTokenInfo of the class DVBPKCS11Provider can be
used to get the list of slots and tokens available. The default slot used will
be defined by the java property "dvb.security.pkcs11.defaultSlotId".
If an application needs to use another slot, it should call the method
DVBPKCS11Provider.setSlotId(int slotId) to change the slot used by the provider.
The slot can only be changed when the provider is not logged into the token.