Flaky test pass1

[bretambrose]

• Update shared subscription test to remove invalid assertions on a property that does not necessarily hold (all subscriptions receive messages)
• Increase socket timeout on request-response 311 tests
• Update 311 will test to work around broker race condition wrt which connection gets terminated on duplicate client id

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[xiazhvera]

Not really an issue for this PR, while I just wonder if we have any mechanism that help to improve the infinitely waiting on the mutex/future? We used futures and mutex in plenty of places in the unit tests, and did not have a proper way to timeout for the wait so far.

[bretambrose]

We'd need to update the condition variable wait to be time based and then check the result (rather than assume it's set) and fail the test.

So here, it would change to something like:

...
interruptCv.wait(lock, [&]() { return interruptConnectionAttemptComplete; }, std::chrono::seconds(60));
ASSERT_TRUE(interruptConnectionAttemptComplete);