investigate flaky inspector/test-inspector on Windows

Fails intermittently on Windows 2012r2 / VS 2015 on CI.

https://ci.nodejs.org/job/node-test-binary-windows/4057/RUN_SUBSET=1,VS_VERSION=vs2015,label=win2012r2/console:

not ok 296 inspector/test-inspector
# Error: read ECONNRESET
#     at exports._errnoException (util.js:1026:11)
#     at TCP.onread (net.js:572:26)
# [err] Debugger listening on port 9229.
# [err] Warning: This is an experimental feature and could change at any time.
# [err] To start debugging, open the following URL in Chrome:
# [err]     chrome-devtools://devtools/remote/serve_file/@60cd6e859b9f557d2312f5bf532f6aec5f284980/inspector.html?experiments=true&v8only=true&ws=localhost:9229/node
# [err] 
# [test] Verifying debugger stops on start (--debug-brk option)
# [test] Setting a breakpoint and verifying it is hit
# [out] A message 5
# [out] 
# [test] Verify we can read current application state
# [test] Verify node waits for the frontend to disconnect
# [out] Outputed message #1
# [out] 
# [err] Debugger attached.
# [err] Waiting for the debugger to disconnect...
# [err] 
# [test] Connection terminated
  ---
  duration_ms: 0.536

/cc @eugeneo