* Remove the server_id from session table, change it to worker_id on session_connection
This is step 1 in updating the worker table. The worker is becoming a public resource so it must have
a public id. We drop the server_id column on the session_connection table and add the worker_id column
so we can use the wt_public_key type. Since db migrations are applied while the controller is offline,
it should be safe to assume all session connections are not in a running state, thus allowing us to null
out all the worker ids in the session_connection table.
For now we don't have very good enforcement of the wt_public_id contraints, since the id is currently
defined in the worker config, but this will soon change and the worker's id will be generated by the
controller.
* Updating server_id references to controller_id.
* Adding worker tag db writing test.
* Move the server table back to the top.
* Update comment for the worker object.
* Update comment for the worker table.
* Update the newWorkerId call to take a context and fix its error.
* Correct comment for the wt_network_address domain.
This creates a domain service function `session.WorkerStatusReport`. The
service performs two functions:
1. Checks the status for all of the reported sessions, returning a
report of the sessions that are in a "non-active" state, i.e.
"cacneling" or "terminated".
2. Looks for any "orphaned" session connections, i.e. connections that
are active but were not reported by the worker. These connections are
marked as closed.
This also removes the "ShouldCloseConnectionsOnWorker" logic, as this
was determined to not be a possible state, and was unnecessary.
Todd
Timothy Messier