Add log warning message about when not on us-region

[kitofr]

• Non us-regions are not supported for mocks. Added message

[geemus]

The error raised here is intended to be inline with the behavior you would see in live usage (I think). Maybe it would be better to use Fog.warning and leave the error unchanged? What do you think?

[kitofr]

That sounds like a fair solution. I merely wanted to get some heads up about the region problem whilst using Mocks.
I'll see if I can change it to use Fog.warning instead.

[geemus]

Sounds good, thanks!

[lanej]

@kitofr please rebase off of master

[geemus]

Thanks!