[inventory] manage ssh connectivity in shared ssh.cfg usable outside of ansible with optional local overrides in ssh.cfg.local, use ssh.cfg in ansible and eliminate ssh config bleed from ~/.ssh/config, collect host key fingerprints in shared known_hosts file populated with fingerprints of reachable hosts

inventories/external/hosts.yaml

@@ -2,8 +2,6 @@ all:
   hosts:
     status:
       # TODO: Manually set up ufw on the host. Create a role for ufw.
-      ansible_host: status.hamburg.ccc.de
-      ansible_user: chaos
 base_config_hosts:
   hosts:
     status: