Closed Issue: ODataUriUtils.ConvertToUriLiteral does not support Enum [1608]

ODataUriUtils.ConvertToUriLiteral and ConvertFromUriLiteral do not support Enum

Please fix ```
ConventionsHelpers.GetUriRepresentationForValue
``` after Enum is supported
Comments: The workaround code is updated to use the ODataUriUtils.ConvertToUriLiteral in ODL.