Add raw-track-access mode support for ECKD disks

[asmit27rai]

Summary

Adds support for raw-track-access mode on ECKD disks, allowing Feilong to handle:

• Direct writing of raw track data without filesystem formatting
• Deployment of z/OS and other non-Linux disk images
• Existing pre-formatted ECKD disk images

Related Issues

Fixes: #714

[asmit27rai]

@Bischoff Pls review this PR

[Bischoff]

Thanks for the great PR, but this looks to me incomplete:

• Aren't we missing something in zvmsdk/api.py? Here:

    def image_import(self, image_name, url, image_meta, remote_host=None):
        """Import image to zvmsdk image repository

• Shouldn't we adapt unit tests? Like in zvmsdk/tests/unit/test_imageops.py
• Please udate documentation so the new parameter appears in https://cloudlib4zvm.readthedocs.io/en/latest/restapi.html#create-image
• and every other place I might have missed...

[Bischoff]

@asmit27rai I can see you are candidate for the 2025 Linux Foundation mentorship. Be warned that candidates are selected first on their resumes, then on an online interview. Open Source contributions are not taken into account in this selection process. Don't contribute in the hope it will make you selected.

Don't misunderstand me: your contributions are really impressive, and they are much appreciated! Thank you! But if you do them, just do them for the fun, or for the sake of the project, or out of curiosity. There is no reward implied.

As an unrelated side note, I doubt you have been able to test your code. Before merging it, we would need to test it in a real mainframe testbed.

[Bischoff]

Can you please explain this line?

I don't see how rawTrackAccess is used in this command.