pki: T4026: Only emit private keys when available (#3669)

* install_certificate() code path handles private_key=None &
  key_passphrase=None OK already
* file and console output paths will error trying to encode None as a key
* This is only an issue for a couple of the generate_*_sign() functions,
  where having a null private key is possible
  * Self-signing and CA creation always generate a private key
  * Certreqs will generate a private key if not already provided
* Do not prompt for a private key passphrase if we aren't giving back a
  private key

(cherry picked from commit d2cf8eeee9053d04f34c5e8a22373290d078ab37)

Co-authored-by: Andrew Topp <andrewt@telekinetica.net>

0 files changed, 0 insertions, 0 deletions