Ensure alphabetical order of xml attributes

Ensure alphabetical order of xml attributes

Python 3.8 removed artificial alphabetical ordering
of attributes in ElementTree. The recommended solution
to avoid changes in generated xml is to add attributes
in the alphabetical order directly in the source code.

See https://github.com/python/cpython/commit/63673916464bace8e2147357395fdf3497967ecb

Components: Framework

VK-GL-CTS issue: 2358

Change-Id: Ife4b93a01d76f1f99fcdf2c1d13291ae5c706d85
(cherry picked from commit b2d84418efc74c558be55c2934e14c2a93edefed)