Improvements to message displayed when python path is invalid (in launch.json)

[DonJayamanne]

Currently when debugging we validate the python path and display generic message with a tip in the message prompting them to click on status bar.
However, if pythonpath is valid in settings.json but invalid in launch.json, then the status bar would display the python version.

I.e. the message (tip) needs to change accordingly.
Suggestion - Try to determine where python path is invalid, settings.json or launch.json

Change message to: "The Python path in your debug configuration is invalid"
Have a single button: ["Open launch.json']