Update with more informative message when users run 'mlflow ui' with … (#2885)
Update with more informative message when users run 'mlflow ui' with … (#2885)

* Update with a more informative message when users with source-installation mlflow run mlflow ui

* Update __init__.py

* Update __init__.py

* Update __init__.py

* update server/__init__.py

Co-authored-by: Siddharth Murching <e2078d1fd970cba41399695dd693b4d6120ac16d@databricks.com>
mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow,mlflow/mlflow