The import of the yardstick module was removed from test_util.py, which relied
on this module location for a file name in
test_import_modules_from_package_no_mod and test_import_modules_from_package.
JIRA: YARDSTICK-1258
Change-Id: I754dbadfb8d788236f354e9a0c1a61ad6c4abf70 Signed-off-by: Emma Foley <emma.l.foley@intel.com>