Please consider publishing the test dependencies for the mgmt packages to PyPI

Hey folks,

I've been maintaining some parts of the Azure SDK for Python in Fedora. One issue with many of the packages is that they use test components from [azure-sdk-tools](https://github.com/Azure/azure-sdk-for-python/tree/321370a7c625eb3c61d0ae849cea1ad5e836c1a8/eng/tools/azure-sdk-tools).

The problem is that it's no longer published to PyPI, nor is it tagged as far as I can tell. Additionally, it mixes in a bunch of test utilities with maintainer utilities (again, as far as I can tell).

Fedora runs the package test suite as part of packaging. This is important because it regularly integrates the latest version of Python and as a result consistently hits (and fixes) many backwards incompatible changes and the test suites help with that.

It would make my life significantly easier if the test utilities were in a package that was versioned, published to PyPI, and didn't mix in other developer utilities.