Creating new python env requires a restart of application to detect

[jpotts18]

Issue Type: Bug

1. Open VS Code
2. Open terminal
3. $ virtualenv ~/Env/some-new-env
4. Go to change intepreter
5. Can't find interpreter

Restart VS Code it shows up.

Extension version: 2019.5.18426
VS Code version: Code 1.35.0 (553cfb2c2205db5f15f3ee8395bbd5cf066d357d, 2019-06-04T01:16:40.241Z)
OS version: Darwin x64 18.2.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz (8 x 2500)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled surface_synchronization: enabled_on video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 3, 3
Memory (System)	16.00GB (0.56GB free)
Process Argv	-psn_0_15445690
Screen Reader	no
VM	0%

[DonJayamanne]

Duplicate of #2640