Add manual two factor authentication

[jan-janssen]

Example configuration:

queue_type: REMOTE
queue_primary: cm
ssh_host: gateafs.rzg.mpg.de
ssh_proxy_host: cmti001.bc.rzg.mpg.de
ssh_username: janj
known_hosts: ~/.ssh/known_hosts
ssh_password:  ********
ssh_two_factor_authentication: True
ssh_remote_config_dir: /u/system/SLES12/soft/pyiron/dev/pyiron-resources-cmmc/queues/
ssh_remote_path: /cmmc/u/janj/remote/
ssh_local_path: /Users/jan/notebooks/
ssh_continous_connection: True
queues:
  cm: {cores_max: 1200, cores_min: 1, run_time_max: 5760}