Optimize sap module to prevent high IO workload (bsc#1241455)

[vzhestkov]

What does this PR change?

In some deployments sap module could cause high IO workload in case of having large amount of directories inside the sap base path not related to sap instances.

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

ℹ️ If a major new functionality is added, it is strongly recommended that tests for the new functionality are added to the Cucumber test suite

• Unit tests were updated

• DONE

Links

Tracks: https://github.com/SUSE/spacewalk/issues/27037

• DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

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[agraul]

This will be overridden by the loader but helps dev toos to know that it will be present and a dict. Would be nice to keep it.