Schema and model class for the command log

The command log will allow us to both store an audit trail of commands
issues against the server and use those commands to report status and
errors of background jobs connected to specific commands.
Add logic for creating (starting) and finishing commands
No functional change - remove trailing whitespace
Have all commands add an entry to the command log

Any successfully submitted command will now create an entry in the command
log, and the command specs check for that. For now, all commands will
pretend to be synchronous, and report a status of 'finished' when the
corresponding request ends.
Update command status for background tasks

For ISO import, we thread a command object through to the message
processor, tkaing care to pass it along to each stage of the import
process. The import process then updates the status of the command, in
particular marks it as 'running' as soon as it starts working on it, and
marks it as 'finished' when the last step of the import saga is done.

Most of the error reporting is done by our message processor - that is
crude, and better ways to report errors from within the actual processing
is the main reason why we try to pass the command to each stage of the
saga.

We can't demand that all background tasks have a command associated with
it: changing node metadata and tag rules spawn background jobs in
Node.around_save and Tag.around_save, where they do not have access to a
command object, nor does it seem desirable from the user's POV to treat
them as async commands - or should we ? Might actually be nice for the user
to know that the system's state has settled after doing e.g. a change to a
tag. Though can we always assume that every background process is directly
connected to a command ?

The way the command is threaded through all over the place is a bit clumsy;
an alternative would be to have the messaging plugin define a 'command'
method that returns the command associated with the operation if there is
one, and methods that are called during async processing can access it that
way to e.g. report errors or update the status
Add a command collection to the API

Provide the standard means for listing all commands (in descending order of
submission) and to get the details about a specific command.