Fix connectivity issues in Ansible lesson

[Mierdin]

This fixes some long-standing issues in the Ansible lesson.

/cc @IPvSean

Banner SSH Timeout connecting to vQFX

This has been a known problem for some time. At the time the only known solution was coming in this PR: ansible/ansible#68184

However, as of today it's still not merged, and unclear if it would actually fix the problem. On a whim I did some additional googling and found this SO post, which mentions this could be caused by using the wrong ansible credential parameters. I changed this and it immediately and consistently fixed the problem. So this PR includes that fix.

Closes #304

Cumulus Connection Issue

Also started running into this:

TASK [template out cumulus configuration for free range routing] ************************************************************************
fatal: [cvx1]: UNREACHABLE! => changed=false 
  msg: |-
    Failed to connect to the host via ssh: Warning: Permanently added 'cvx1,10.101.158.199' (ECDSA) to the list of known hosts.
    Control socket connect(/home/antidote/.ansible/cp/10b222d3e0): Connection refused
    Failed to connect to new control master
  unreachable: true

This issue suggested some additional configuration options to ansible.cfg, which I added in the final stage. Other stages which include cumulus may want to borrow this section.

[nre-labs-preview]

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Preview Service Documentatation

Details

• Commit: 6662d66
• Logs: https://gist.github.com/4b3c7b26d22215cdd13861eb1f99c30c
• Inspect Traces: https://inspect-preview.nrelabs.io/search?lookback=12h&operation=api_livelesson_request&service=preview-xu59lec
• LivePreviewID: xu59lec