tests: fix packaging for s/filestore/objectstore/

The binaries file name have changed and need to be updated in the
packaging files for deb and rpm. Fix a few leftovers as well.

Fixing 1a588f18ba0e57df64f8a48c1393a4bc65019571

Signed-off-by: Loic Dachary <loic@dachary.org>