L2SS-244: Return a scalar if given a scalar

(cherry picked from commit 68b98aa8)

L2SS-244: Dim (1,0) is by definition a scalar according to PyTango. Honour this.

(cherry picked from commit d487f383)

L2SS-244: Configure logging to actually see log lines in 'docker logs device-xyz'

(cherry picked from commit 2892211f)

L2SS-244: Default to scalar attributes in attribute_wrapper

(cherry picked from commit ecf4c781)

L2SS-188: Renamed statistics_device -> Statistics, as it's a name, and it's a device per definition.

L2SS-192: reserved_0 -> reserved to not be overly defensive. if there are multiple reserved fields in the future, we'll deal with that by then.

L2SS-192: Provide interface for raw header fields, add example packet (needs to be a better one, but this is all we have for now)

L2SS-192: Provide interface for raw header fields, add example packet (needs to be a better one, but this is all we have for now)