[PDF] [SPEC] Add 'version: 1.0'

[PDF] [SPEC] Add 'version: 1.0'

- add 'version: 1.0' to PDF spec;
- add 'version: 1.0' to all existing lab PDFs;
- extend schema with new property;
- add workaround for value-based decision-making in schema version
  selection via `validate-template.py`;
- add support for multiple schema versions;
- add versions for all schema blocks defined so far;
- fix PDF schema pattern for disk size decimals (e.g. '1.8T');

Change-Id: Ie8f768803ec19f1f9a7982fe5ca59df80764fc4a
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>