Bump tough-cookie and @azure/ms-rest-js (#516)

Removes [tough-cookie](https://github.com/salesforce/tough-cookie). It's no longer used after updating ancestor dependency [@azure/ms-rest-js](https://github.com/Azure/ms-rest-js). These dependencies need to be updated together.


Removes `tough-cookie`

Updates `@azure/ms-rest-js` from 2.6.6 to 2.7.0
- [Changelog](https://github.com/Azure/ms-rest-js/blob/master/Changelog.md)
- [Commits](https://github.com/Azure/ms-rest-js/commits)

---
updated-dependencies:
- dependency-name: tough-cookie
  dependency-type: indirect
- dependency-name: "@azure/ms-rest-js"
  dependency-type: indirect
...

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