1. Default without backup.
1. Support `--override` option, this would remove those host undefined in playbook.
1. Support parsing `ansibl_ssh_port`/`ansible_port` and `ansible_ssh_user`/`ansible_user` as host's SSH connection information.
1. Adjust dry run print result to ssh config format exactly.
1. Dependencies version limitation.
- ansible==2.10.5
- sshconf==0.2.5