Only the request middleware loaded the Settings page values, so in the
worker process app_settings stayed empty: a VM create job failed reading
the default volume format, and the snapshot free-space check fell back to
its defaults. The worker now loads them before each job.
The list and the detail page were rendered once, so a job that finished
kept showing running until the page was reloaded by hand. While a shown
job is queued, running or cancelling, the page now reloads every five
seconds (not while hidden or while a form field has focus).
