Remove a factory instance. Remove the factory instance associated with the PID. If the instance was registered with the service registry, it should be unregistered. The Configuration Admin must call deleted for each instance it received in {@link #updated(String,Dictionary)}.
If this method throws any {@code Exception}, the Configuration Admin service must catch it and should log it.
The Configuration Admin service must call this method asynchronously.
@param pid the PID of the service to be removed