Add support for custom license templates

[inteon]

Adds BOILERSUITE_TEMPLATE_DIR env variable that lets you specify your own license template folder

[jetstack-bot]

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[cert-manager-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign sgtcodfish for approval. For more information see the Code Review Process.

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[cert-manager-prow]

@inteon: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cert-manager-boilersuite-verify	0d11451	link	true	/test pull-cert-manager-boilersuite-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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