* fix ale_python_auto_virtualenv to correctly set virtualenv env vars
According to the documentation, `ale_python_auto_virtualenv` should automatically set environment variables for commands, but previously the variables were not set completely or correctly.
Before:
`PATH` variable was expanded to include `/path/to/venv`
After:
`PATH` variable is expanded to include `/path/to/venv/bin`
`VIRTUAL_ENV` variable is set to `path/to/venv`
This mimics exactly what the `activate` scripts do, and allows the configuration knob to work as expected.
For example, after this change, `jedi-language-server` can be installed globally (instead of inside every venv), and it will "just work" (e.g. find references to dependencies in the venv) when editing a file in a project that uses a venv, because the correct variables are set.
* fix test_python_virtualenv.vader test to expect output with both virtualenv vars
* remove unnecessary non-escape in test_python_virtualenv.vader
* fix accidentally removed space in windows test_python_virtualenv.vader
