tests: allow passing additional arguments to nspawn via NSPAWN_ARGUMENTS
(cherry picked from commit 57916ea352b85153ecbed803d52861ca8b933dd3)
patch_name: 0103-tests-allow-passing-additional-arguments-to-nspawn-v.patch
present_in_specfile: true
location_in_specfile: 103
squash_commits: true