[bug#28198] [PATCH] Add MongoDB package and service.

[Christopher Baines]

This is a work in progress issue for supporting MongoDB in Guix.

Back in March 2016, Roel Janssen sent a working package patch to
guix-devel, but there was concern from those reviewing about the
security implications of the amount of third party code that is
included with the MongoDB source.

I've taken that original patch, and started to try and get MongoDB to
build using libraries and tools from Guix. In addition, I've added a
very basic service definition and system test.

This isn't ready to be merged yet, but I think it's good to work on in
public. Patches to follow...

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