HP repo uses stretch dist instead of the Ubuntu-specific one(s)

The SSACLIStrategy adds a Debian stretch repo source, when the Ubuntu ones are available. We should switch to the more release-appropriate ssacli packages.

See https://downloads.linux.hpe.com/SDR/repo/mcp/dists/

Locate the SSACLIStrategy implementation and inspect how it adds the Debian stretch repository source. Compare the available Ubuntu distributions at the linked HPE repository, then update the source selection to use the appropriate Ubuntu-specific ssacli package repository and verify the resulting configuration.

Written by the indexing model from the issue text.