ansibleise SSH config for old switch

```
root@login:~# cat .ssh/config 
Host switch
	User sown
	KexAlgorithms +diffie-hellman-group1-sha1
	Ciphers aes256-cbc
	HostKeyAlgorithms +ssh-rsa
```

these machines are new and shiny so we could actually put this in `/etc/ssh_config.d` I think