Add condition "nodes" that triggers a task everytime a Consul node is updated

[remilapeyre]

[findkim]

Adding one more comment that is not an ask.

The content added in templates/tftmpl/tmplfunc/nodes.go and its test file would be great to move to the hashicorp/hcat library. It's where general Consul API handling is done for templates. The library will be also adopted by Consul-Template, and I can imagine that others would benefit from your addition for nodes and filtering support!

@mkam has some hcat work inflight too, so that's why it's not an ask for you to move it there. We can handle that and updating the CTS dependency on the library afterwards.

[mkam]

Hi @remilapeyre, just for awareness, we did a fairly major refactoring of our conditions code (see https://github.com/hashicorp/consul-terraform-sync/pull/385), so your PR is out of date with how conditions are structured now. Please let us know how you'd like to proceed with your changes!

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