This commit introduces a new net.Conn implementation (countingConn) that
will keep track of bytes read and written for a particular client
connection. This is then implemented into the worker code using
interface composition.
Refs: #2501
* Move the server daemons into their own package
With this change the internal/server package now is dedicated to the server domain (workers and controllers) and not to the server daemons.
The hope is that this will make it easier to keep the daemons decoupled from the representation of the servers in the database.