Drop overly opinionated ssh_config defaults

This set of options reflect the ssh_config options that are set by
default on Debian. The way this was set before has the potential to
break exisisting setups that rely on "normal" defaults, rather than the
rather opinionated ones that are now being shipped with this formula.

openssh/defaults.yaml

 ssh_config:
   Hosts:
     '*':
-      ForwardAgent: no
-      ForwardX11: no
-      RhostsRSAAuthentication: no
-      RSAAuthentication: yes
-      PasswordAuthentication: yes
-      HostbasedAuthentication: no
-      GSSAPIAuthentication: no
+      SendEnv: LANG LC_*
+      HashKnownHosts: yes
+      GSSAPIAuthentication: yes
       GSSAPIDelegateCredentials: no
-      BatchMode: no
-      CheckHostIP: yes
-      AddressFamily: any
-      ConnectTimeout: 0
-      StrictHostKeyChecking: ask
-      IdentityFile: "~/.ssh/id_rsa"
-      Port: 22
-      Protocol: 2
-      Cipher: 3des
-      Tunnel: no
-      TunnelDevice: "any:any"
-      PermitLocalCommand: no
-      VisualHostKey: no