Dependency on log4net

[kevingy]

Ideally, a dependency shouldn't dictate to the application what logging library to use. As the library consumer, I should be able to tell the library what library my application uses (typically using Microsoft.Extensions.Logging). Doing so everything - the app and the library - uses a common logging infrastructure. With the dependency on log4net, I am required to install log4net when I deploy my app.