Auto-complete does not work when opening cmd.exe/powershell.exe from WSL.

[MahdiGhiasi]

When opening cmd.exe or powershell.exe from WSL, Auto-complete (tab key) does not work in the opened cmd/powershell process. It types a tab character instead.

• My Windows Build Number: 17134.165

• Tested WSL version: Ubuntu 16.04 and Ubuntu 18.04

• Expected behavior: Tab key should suggest based on file names on current directory, just like a cmd.exe/powershell.exe opened directly from start menu does.

• What's happening: Tab key types a \t character on screen instead of auto-completing, when running cmd.exe or powershell.exe from bash.

• Steps to reproduce:

1. Open a bash Window.

2. Type cmd.exe (or powershell.exe) and press enter.

3. Type a character and press tab button.

• GIF showing the issue:

[zadjii-msft]

This is a dupe of a bunch of issues that are all fundamentally fixed by #57, which is already available in Insiders.