UI needs link for glowroot

[eostermueller]

The snail4j UI needs a link to the locally deployed glowroot, and the tcp port number in the URL should be the one configured in the snail4j.json file, sutAppPort attribute.

When I hit http://localhost:4000/, that expands to this:

http://localhost:4000/transaction/throughput?transaction-type=Web&last=1800000

But the last=1800000 (30 minutes) is too big of a time window.
Need to change that to last=180000 (3 minutes), so immediate changes will be better reflected.

With a larger window like the default 30 minutes, immediate changes take minutes to fully render.