Worker: set or lookup the collections adaptor version

[josephjclark]

Short Description

This PR levelsup the worker to know about which version of the collections adaptor to be used.

You can pass in a version explicitly, via the cli or env var. If no version is provided, the server will look up the latest version on npm.

This arises because of #462, where in the worker needs to know a specific adaptor version to autoinstall (using latest all the time just doesn't work very well).

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[josephjclark]

An integration test has started failing, something to do with the jwt. It's actually faiing for me on master too.

I'm going to merge this and then fix it on the other branch (if it doesn't go away)