(#15841) Update acceptance tests.

This patch updates acceptance tests so that they do not
check for the presence of a temporary directory which used
to be created during a module build. It served as the
master copy of the module content, i.e. the module tarball
used to be created by packing the content of that direcotry.
This is not the case any more as the files are added to the
module tarball directly from their source location.