Update _helpers.tpl

[suse-coder]

This should fix that
#615

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[benbz]

As mentioned in #615 (comment) we'd only be happy with experimental and policy being underrides, and so overridable with user config. This change makes everything overridable. config.yaml will need to be split into 2 files with appropriate settings in each.

If there's other settings you think should be overridable with user config, I'm happy to have a discussion

[suse-coder]

What about removing it: access_token_ttl fully from that (as the other experimental settings are also not there). So everybody can choose his value.

[benbz]

What about removing it: access_token_ttl fully from that (as the other experimental settings are also not there). So everybody can choose his value.

We've discussed this internally and this is also an acceptable solution. On reflection we think the original trigger we had for raising the access_token_ttl has been resolved

[benbz]

Closing as CLA was never signed and change in this PR was not appropriate

#745 will accomplish what this PR wanted