Package Manager's direct-write mode still tries to check for rsync

Committers, please backport this to 11.2.x. It is a show-stopping bug for the new direct-write mode, and is an internal change in an experimental module that does not affect the data layer in any way.

This change makes sense and the test coverage is clear (and fails without the fix)

Committed to 11,x and backported to 11.2.x

larowlan → closed merge request !12286