Add ability to change pylint's python interpreter when changing working interpreter

[chaNcharge]

Environment data

VS Code version: 1.18.1
Python Extension version: 0.8.0
Python Version: 3.6.3 and 2.7.14
OS and version: macOS 10.13.2

Feature request

I frequently work with two different python versions, python 2.7.14 and 3.6.3. I have pylint installed on both versions; however, when I switch interpreters from 2 to 3 (and vice versa), pylint is stuck on the python 2 interpreter, which was the version pylint was most recently installed. I know it's possible because I made a shell script in my system's path that can change pylint python interpreters once, but it'd be even better if it it works within VSCode.

Actual behavior

I have to change pylint python version manually by reinstalling it in the appropriate python version, or by uninstalling the one I'm not using.

Expected behavior

When I change python interpreters, pylint will also change to the respective python interpreter. Like running a command with python3 -m pylint ... or python2 -m pylint ...

[brettcannon]

Currently @DonJayamanne is working on refactoring our tool execution code so this should hopefully get fixed when that work completes. As of right now the issue is we are executing the pylint command which means you probably that command links to your Python 2 install.