Fix sql pool deployment.

[isaacabraham]

This PR closes #1024 .

The changes in this PR are as follows:

• Fix Elastic Pools by setting capacity instead of `size.

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

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

This does not change the API in any way. It is a change to the ARM but fixes what evidently did not work.

[isaacabraham]

@ninjarobot I vageuly remember trying Capacity and it not working and moving to Size at one point. I don't know how though!

Any chance we can push a release out in the next day or two?

[ninjarobot]

Any chance we can push a release out in the next day or two?

@isaacabraham of course, cutting a release now.

[ninjarobot]

Thanks for the fix. This is now released in 1.7.20 and available on nuget.