Update coverage to look for correct test dlls

[cijothomas]

No code change. Update script to report codecoverage

Short description of the fix:

• I ran all unit tests locally
• CHANGELOG.md updated or do not need to be updated
  • If not tell why:

For significant contributions please make sure you have completed the following items:

• Changes in public surface reviewed
• I ran functional tests locally.
• The PR will trigger build, unit test, and functional tests automatically. If your PR submitted from fork - mention one of committers to initiate the build for you.

[cijothomas]

Ignore for now as a new script is going to replace this one.