test: allow inspector to reopen with same port

[gibfahn]

Test checks that if you open the inspector with '0' (pick a random free
port), close it, then reopen it, you get a different port. However this
isn't necessarily true.

Fixes: #14316

Refs: #14316 (comment)

So this assertion checks that when you close and reopen you don't get the same port. However AIUI node just picks a free port, so there is a (very small) chance you'll get the same port.

cc/ @sam-github as you wrote the original test.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

test, inspector

[tniessen]

I wonder why the assertion was there before. LGTM assuming that the inspector correctly closes the socket.

[gibfahn]

LGTM assuming that the inspector correctly closes the socket.

That's tested above by closeWhenOpen()

[gibfahn]

CI: https://ci.nodejs.org/job/node-test-commit/11724/

CI was green except for macOS, which failed with:

not ok 827 parallel/test-cluster-send-handle-large-payload
  ---
  duration_ms: 120.14
  severity: fail
  stack: |-
    timeout
  ...

which is #14747

[gibfahn]

Adding dont-land labels as the test doesn't exist on v6.x.