Make sure block hound works in a server

We should be able to drop the blockhound jar into the server and have it automatically detect non blocking issues that aren't excluded. Today this is not posisble.

Unfortunately, due to how we de do tiered class loading it is not possible to add block hound to the server/lib directory as nested class references will be loaded from the child class loader, so this JIRA is just to get it working in the lib directory.