test: wait for TCP connect, not TLS handshake

Test assumed server gets a handshake before the client destroyed it, and
didn't assert that dns.lookup() callback occurred.

PR-URL: https://github.com/nodejs/node/pull/25508


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>