SSH host key checking not enabled for proxied connections

Summary

(Summarize the bug encountered concisely)

Steps to reproduce

1. Set ssh_disable_host_key_checking to yes
2. Define the ssh_proxy host.

Expected behavior

Host key checking disabled for the proxied connection.

Actual behavior

Host key checking not disabled for the proxied connection.

Relevant logs and/or screenshots

Possible fixes

Check this out:

ansible_ssh_extra_args: >
  {% if ssh_disable_host_key_checking %}-o StrictHostKeyChecking=no -o UserKnownHostsFile="/dev/null"{% endif %}
  {% if ssh_proxy is defined %}-o ProxyCommand="ssh -q -W %h:%p {{ hostvars[ssh_proxy].ansible_user }}@{{ hostvars[ssh_proxy].ansible_host }}"{% endif %}