Use dash instead of underscore in uyuni-configfiles-sync generated paths

[cbosdo]

What does this PR change?

Replacing slashes by dashes in paths makes it hard to work with. Using underscores is more user friendly.

GUI diff

No difference.

• [X] DONE

Documentation

• No documentation needed: only internal and user invisible changes

• [X] DONE

Test coverage

• No tests: already covered
• [X] DONE

Links

Issue(s): # Port(s): # add downstream PR(s), if any

• [ ] DONE

Changelogs

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Re-run a test

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• [ ] Re-run test "backend_unittests_pgsql"
• [ ] Re-run test "java_pgsql_tests"
• [ ] Re-run test "schema_migration_test_pgsql"
• [ ] Re-run test "susemanager_unittests"
• [ ] Re-run test "javascript_lint"
• [ ] Re-run test "spacecmd_unittests"

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