Fix failing GitHub Actions tests

[LinuxJedi]

The cmsutil and ssltap tests were not actually testing wolfPKCS11, and this wasn't clear until the GitHub Actions cached was purged. This caused them to start failing on all PRs.

This PR:

• Drops the usage of pk12util, this requires custom NSS functions that we probably cannot implement in FIPSv5
• Adds the CKA_NSS_EMAIL attribute for certificates (needed for certutil)
• Fixes issues in the NSS config string parser (required for ssltap)
  • Empty quoted values aborted with error instead of skipping
  • Values that were not surrounded with quotes broke the parser
• Fixes ssltap test not actually compiling / installing wolfPKCS11