security/monkeysphere: update 0.42 to 0.43

• Depend on a modern version of GnuPG (>= 2.1.11) for --export-ssh-key
• Depend on OpenSSH's ssh-keygen directly for most SSH fingerprints
• Depend on OpenSSH >= 6.0 for ed25519 and "sshd -T"
• Use runuser instead of su
• Support Ed25519 authentication-capable subkeys for users
• Use https for all outbound links
• Clean up spelling
• Use 3072 bits for RSA keys everywhere by default
• Provide clearer error message for PEM2OPENPGP_NEWKEY
• Avoid locking out users unnecessarily
  
  https://github.com/dkg/monkeysphere/tree/monkeysphere_0.43