Reviewer: AMC - Add support for multiple diameter connections to homestead

Hi Andy,

For now, please can you review these 3 pull requests (homestead, freeDiameter and cpp-common) to add support for multiple diameter connections to homestead. I think you know the story pretty well, but feel free to ask any questions.

I haven't bothered putting any UTs in here because they're incomplete and I'm not that bothered about you reviewing them. I intend to have the realmmanager diamaterresolver classes in cpp-common fully UTed.

Thanks,
Graeme