BDR and NIA adjustments

[taylordowns2000]

Summary

This PR introduces a mock-validator which is used by ghana-bdr and ghana-nia to verify that the request bodies sent to a specific endpoint match the requirements for those systems.

I think that the improved mocks for these adaptors are not particularly interesting for you guys. The thing that I'd like your thoughts on is whether or not the mock-validator is in the right place. I can see myself using this type of simple helper for building mock servers a lot.

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Before merging, the reviewer should check the following items:

• Does the PR do what it claims to do?
• If this is a new adaptor, added the adaptor on marketing website ?
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[josephjclark]

@taylordowns2000 not in tools please! There is no runtime code in tools.

I agree that a general validator seems useful, although I'd probably recommend using json schema (we have a function for that in common, see for reference). But for now, I'd just bake it into the adaptor that needs it and we'll work out how to generalise later.

[josephjclark]

@taylordowns2000 we need to fix or skip that failing test before merging

Don't feel you need my approval before updating these adaptors btw (unless you're doing something unusual, like digging into tools/!

[mtuchi]

Move this to mocks.js file in their respective adaptors