Lcg/run levels

[lamont-granquist]

closes #1642

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[coderanger]

If we are adding this, it should be added to all service providers where it makes sense and should be a fatal error is specified for a provider that doesn't support it.

[lamont-granquist]

We already decided to merge #1642, this is just the work to rebase, add a changelog and add the one missing spec

[coderanger]

Okay, should add the fatal error for other providers then.