Add support for imperative container management

The command nixos-container can now create containers.  For instance,
the following creates and starts a container named ‘database’:

  $ nixos-container create database

The configuration of the container is stored in
/var/lib/containers/<name>/etc/nixos/configuration.nix.  After editing
the configuration, you can make the changes take effect by doing

  $ nixos-container update database

The container can also be destroyed:

  $ nixos-container destroy database

Containers are now executed using a template unit,
‘container@.service’, so the unit in this example would be
‘container@database.service’.

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