[FAB-3772] Improve coverage for PKCS11 package (2 of 3)
[FAB-3772] Improve coverage for PKCS11 package (2 of 3)

This is the second of three patches to improve the
coverage of the bccsp/pkcs11 package.

This patch builds on top of
https://gerrit.hyperledger.org/r/#/c/9441

Change-Id: I36eafcebd1a859bf548974492151f2e32b9e37c2
Signed-off-by: John Harrison <f2c7fe5205f724fd9714432f3de84ea143ebcdec@gmail.com>

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