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This commit removes a workaround that was put into directory services
to avoid significant API changes to accomodate customer environments
where AD-related operations would take significantly longer than 60
seconds. In this case the AD startup was backgrounded and a job_id
key added to the return value of activedirectory.update so that
client could optionally wait for the job to complete without requiring
UI updates corresponding with the change. In lieu of this workaround,
convert activedirectory.update and ldap.update to proper jobs and
prevent external callers to the start and stop methods.

This commit also adds revised middleware test assets for directory
services.