Lower thread pool timeout

[aikar]

DynmapCore/src/main/java/org/dynmap/DynmapCore.java

Line 795 in c3cdff4

ExecutorThreadPool pool = new ExecutorThreadPool(2, maxconnections, 60, TimeUnit.SECONDS, queue);

I noticed in debugger that I had a ton of "etp" threads. Traced it down to jetty from dynmap.

The code times them out in 60 seconds, but I'm afraid that each thread is eventually popping 1 task off within that 60 seconds to keep each thread alive. I do not see threads closing....

suggest dropping it to like 1-5 seconds so that they can close and only open on burst traffic.

[aikar]

@mikeprimm saw a thread dump that reminded me of this issue.