Find more software to test with

[JeremyRand]

Potential places to look:

• Search GitHub or https://sources.debian.org/ or https://searchfox.org/ for C_GetFunctionList and other PKCS#11 function names (especially function names that we currently don't implement in p11mod).
• Search GitHub or package repos or Repology for pkcs11 or p11.
• Search the dependency graph for other software that uses the PKCS#11 libs that are used in our current tests.

Once you find something, create an issue, or jump right in and add integration tests in a PR. If your integration tests don't pass (perhaps because of a bug in pkcs11mod) but you believe they are useful, that's fine, you can submit them anyway, and we can just instruct Cirrus to allow failure on them.