This fixes a potential segfault, among various other likely-related
issues, which all occur because TLSSockets were not informed if their
underlying stream was closed in many cases.
This also significantly modifies an existing TLS test. With this change
in place, that test no longer works, as it tries to mess with internals
to trigger a race, and those internals are now cleaned up earlier. This
test has been simplified to a more general TLS shutdown test.
PR-URL: https://github.com/nodejs/node/pull/49327
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>
