Directory for ssh private keys used by ssh to authenticate to virtual machines.
They are used by ssh -i when l3vm connects to virtual machines and prevent questions for password when user does not have it's own private keys configured.

This directory can be left empty.

Recognized files:
  id_rsa
  id_ecdsa
  id_ecdsa_sk
  id_ed25519
  id_ed25519_sk

