[RFT v2] test-pmd: go back to using cmdline_interact

[Pier Damouny]

> Subject: [RFT v2] test-pmd: go back to using cmdline_interact
> 
> External email: Use caution opening links or attachments
> 
> 
> The cmdline library poll function is broken on Windows and was never
> tested, don't use it.
> 
> Instead, use sigaction() to cancel read character on Unix OS's and a new
> helper to cancel I/O on Windows.
> 
> Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>

Confirmed that this patch fixes Bug: 1180 on Windows.

Tested-by: Pier Damouny <pdamouny at nvidia.com>