[Nut-upsdev] Can't select phoenix as subdriver in megatec_usb

[Boris Kleint]

Hello,

I'm working on getting nut using a Powermust Office 650 USB USV. Using 
today's trunk megatec_usb detects its vendorid 0665 productid 5161 but 
uses the agiler driver for it which apparently does not work 
(timeout...). I think this device is using that USB-to-serial chip but a 
different protocol behind. I got the phoenix subdriver working with the 
device but I had to extend subdriver_list[] by &phoenix_subdriver in 
order to be able to specify it on the command line. Could you please fix 
this in the trunk?

With that change the following ups.conf settings work fine with the USV:

[powermust]
  driver = megatec_usb
  port = auto
  vendorid = 0665
  subdriver = phoenix

Thanks

Boris