Deployments: Default to resource group location rather than West Europe.

[ninjarobot]

This PR improves the default behavior when no location is specified, improving upon the issue in #682, although not quite fixing it yet.

The changes in this PR are as follows:

• Deployments: Default to resource group location rather than West Europe.

I have read the contributing guidelines and have completed the following:

• Tested my code end-to-end against a live Azure subscription.
• Updated the documentation in the docs folder for the affected changes.
• Written unit tests against the modified code that I have made.
• Updated the release notes with a new entry for this PR.
• Checked the coding standards outlined in the contributions guide and ensured my code adheres to them.

[ninjarobot]

@isaacabraham what do you think of this change to remove the default of "westeurope"? The only place it's really breaking is if people don't specify a location and are letting Deploy.execute create the resource group. I think most people that use Deploy.execute are actually specifying a location. The alternative would be to have Deploy.execute default to westeurope so it has the old behavior. Thoughts?

[isaacabraham]

Yes, removing defaults is probably a good thing.

[isaacabraham]

What happens if they don't specify a location - will it error?