Add DS attribute to HOST.HOST_SHARE.DATASTORES in the XML schema

[ms4ons]

Description
The attribute DS is missing in the XML schema. It should be under HOST.HOST_SHARE.DATASTORES.
That affects the generation of pyone.bindings and the attribute .DS is missing there as well.

To Reproduce
With pyone:

>>> import pyone
>>> one = pyone.OneServer('http://localhost:2633/RPC2', session='...')
>>> one.host.info(0).HOST_SHARE.DATASTORES
<pyone.bindings.DATASTORESType33Sub at 0x7a697f568650>
>>> one.host.info(0).HOST_SHARE.DATASTORES.DS
---------------------------------------------------------------------------
...
AttributeError: 'DATASTORESType33Sub' object has no attribute 'DS'

Expected behavior

• The attribute HOST.HOST_SHARE.DATASTORES.DS should be in the XML schema for the host, e.g. here: https://github.com/OpenNebula/one/blob/master/share/doc/xsd/host.xsd#L43
• The code like this should work:

>>> import pyone
>>> one = pyone.OneServer('http://localhost:2633/RPC2', session='...')
>>> one.host.info(0).HOST_SHARE.DATASTORES
<pyone.bindings.DATASTORESType33Sub at 0x7a697f568650>
>>> one.host.info(0).HOST_SHARE.DATASTORES.DS
<pyone.bindings.DSTypeSub at 0x702d87b2df50>
>>> one.host.info(0).HOST_SHARE.DATASTORES.DS.ID
0

Details

• Affected Component: pyone

Additional context
After the schema is updated, users will need to delete pyone.bindings and generate it again. It might be necessary to reinstall pyone.

Progress Status

• Code committed
• Testing - QA
• Documentation (Release notes - resolved issues, compatibility, known issues)