Add debug logging for client port hijack failures in ZooKeeperServerE…

[bigduu]

…mbeddedAdapter

Add debug log for some specify situation to help developer identify the issue location

It's will eat the exception if can't find the ZooKeeperServerEmbeddedImpl class in some case, it will makes keep trying startup the zk server with same port. so the unit test will throw the address in used without any useful info. This change add info for investigate