RFR: 8304174: Remove delays from httpserver tests

[Daniel Jeliński]

On Tue, 14 Mar 2023 19:41:25 GMT, Daniel Jeliński <djelinski at openjdk.org> wrote:

> This change improves the running time of many httpserver tests; it removes the one second delay introduced by `delay()` calls, and performs immediate httpserver stop by calling `stop(0)`.
> 
> For example, `com/sun/net/httpserver/Test1.java` usually takes 20-30 seconds without this change; with this change it completes in 5-8 seconds.
> 
> Tiers 1-3 still green.

50 repeats of tests using SimpleHttpServer also passed. Removing the delays appears to have no effect on test stability.

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PR: https://git.openjdk.org/jdk/pull/13028