Enable add Ansible extra var list

[electrocucaracha]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test

/kind feature

/kind flake

What this PR does / why we need it:
Ansible allows overriding the default value of roles with different methods. This change provides a method to allow the users to pass new values from bash.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[electrocucaracha]

/retest

[electrocucaracha]

/override e2e-ubuntu-focal
/override e2e-fedora-34

[nephio-prow]

@electrocucaracha: Overrode contexts on behalf of electrocucaracha: e2e-fedora-34, e2e-ubuntu-focal

In response to this:

/override e2e-ubuntu-focal
/override e2e-fedora-34

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[lapentad]

/approve

I think ANSIBLE_CMD_EXTRA_VAR_LIST will make the script more flexible

[radoslawc]

/approve
/lgtm

[nephio-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lapentad, radoslawc

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