[Kind: generic_vm] env for VM user and password

[BurlyLuo]

root@r1:/# ps -ef 
UID          PID    PPID  C STIME TTY          TIME CMD
root           1       0  0 02:02 pts/0    00:00:01 python3 /launch.py --username clab --password clab@123 --hostname r1 --connection-mode tc --trace

About generic_vm, we can see the user and passwd is pre-defineded. can we read the user and passwd from clab yaml env parm?

      env:
        QEMU_SMP: 6
        QEMU_MEMORY: 8192
        USER: root
        PASSWD:  yt_xk39b

and Can we also set up passwordless SSH login at the same time?
like:

        sshpass -p "$PASSWD" ssh-copy-id "$USER@$container"

chpasswd:
  list: |
    root: myrootpassword
    clab: clab@123      
  expire: false


            # Disable cloud-init for the subsequent boots
            cfg_file.write("runcmd:\n")

runcmd:
  - sed -i 's/^#*PermitRootLogin.*/PermitRootLogin yes/' /etc/ssh/sshd_config
  - sed -i 's/^#*PasswordAuthentication.*/PasswordAuthentication yes/' /etc/ssh/sshd_config
  - systemctl restart ssh