When we began coding our Tango Device wrapping the cbf-sdp-emulator we
didn't really know how this was going to be deployed in the real world,
and therefore we came up with a generic name for the device class. After
some experience using this in the greater context of SKAMPI and full
deployments, we now know our Tango Device is meant to be used as a
drop-in replacement for the CbfSubarray device of Mid-CBF. Using the
same device class name on our end will ease replacing one by the other,
since the Tango DB contents won't need to be adjusted to reflect which
device is being really used.

Together with this change I also took the chance of simplifying the
entry point for starting the device server, which had some unnecessary
error handling code for little benefit.

This work is part of YAN-685

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Signed-off-by: Rodrigo Tobar <rtobar@icrar.org>