Don't allow pings to prevent timeout

[singpolyma]

Sending a new request shouldn't clear the waiting-for-reply timeout if we haven't got a reply yet, or else we may never time out at all if we keep sending pings (which we do).

[singpolyma]

fixed the test

[sonnyp]

Tests should be updated so that a test would fail before the fix and pass after the fix. The best way to do that is to add a new test that describes the issue for example "Pings do not preven timeouts"

[singpolyma]

Tests should be updated so that a test would fail before the fix and pass after the fix.

Yes, that's what I did. The test previously had a too-long interval so it was over before this case would even trigger and so would pass. As now written it fails without this change and passes with this change.