Fix the DevULong64 key of the NumpyType mapping

Yury Matveevrequested to merge
fix-numpy-devulong64 into develop

NumpyType.mapping used ArgType.DevULong as a key twice, so numpy_type(DevULong) returned uint64 instead of uint32 and numpy_type(DevULong64) raised PyTango_InvalidConversion. The second key is now ArgType.DevULong64, and a test checks the mapping against FROM_TANGO_TO_NUMPY_TYPE in tango/utils.py, which was already correct.

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