* Align MaxPool op attribute 'rounding_type' to spec.
Attribute name should be in lower case.
* Remove obsolete "cacheable" attribute from Parameter.
* Translate ReLU & SoftMax ops type names from ngraph to IR convention.
* Remove <data> node when op has no attributes.
* Translate all operation attributes values to lower case.
* Revert "Align MaxPool op attribute 'rounding_type' to spec."
This reverts commit 243eeccff3.
* Revert "Translate all operation attributes values to lower case."
This reverts commit d4c24175b3.
* Align MaxPool op attribute 'rounding_type' to spec.
Attribute name should be in lower case.
* Align auto_pad & auto_broadcast operation attributes to spec.
They should be written in lowercase.
* Rename op:PadType 'none' to 'explicit'.