Improve logging for vnode

Prepend the host, port and partition in front of all log messages in
skuld.vnode
Add more logging for node
Catch netty client exceptions
Log what vnode the claim was trying to happen from
Add more logging
Add log message for wiping vnode
Log the task count per partition

This will give more info for tracking down #77.
Merge branch 'quiet-netty-client-exceptions' into improve-logging-for-vnode
More logging cleanup

* Ensure client connection refused messages are shorter in the logs.
* Make all node log messages have the host and port prefix
Improve log message
Add logging of claim requests to peers
Merge pull request #71 from eric/improve-logging-for-vnode

Improve logging to aid in debugging transient issues