common: Force reset the LANG related envars in test-locale
common: Force reset the LANG related envars in test-locale

Force reset the LANG related envars in test-locale. This should
force the setlocale() calls to take effect and not anything
in the environment running the tests.

Closes #5461
Reviewed-by: Peter <a316049dd34607c62d4611d63ab22a6454add223@redhat.com>

sgallagher/cockpit,xhad/cockpit,harishanand95/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,arilivigni/cockpit,dperpeet/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,petervo/cockpit,xhad/cockpit,michalskrivanek/cockpit,petervo/cockpit,larskarlitski/cockpit,dperpeet/cockpit,larsu/cockpit,sgallagher/cockpit,larskarlitski/cockpit,larskarlitski/cockpit,petervo/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,Scribery/cockpit,xhad/cockpit,michalskrivanek/cockpit,petervo/cockpit,andreasn/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,arilivigni/cockpit,andreasn/cockpit,andreasn/cockpit,mvollmer/cockpit,petervo/cockpit,harishanand95/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,vanloswang/cockpit,xhad/cockpit,Scribery/cockpit,xhad/cockpit,garrett/cockpit,cockpit-project/cockpit,larsu/cockpit,sgallagher/cockpit,vanloswang/cockpit,stefwalter/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,deryni/cockpit,sgallagher/cockpit,stefwalter/cockpit,arilivigni/cockpit,cockpituous/cockpit,larsu/cockpit,mareklibra/cockpit,harishanand95/cockpit,andreasn/cockpit,dperpeet/cockpit,moraleslazaro/cockpit,petervo/cockpit,Scribery/cockpit,vanloswang/cockpit,garrett/cockpit,arilivigni/cockpit,deryni/cockpit,SotolitoLabs/cockpit,vanloswang/cockpit,deryni/cockpit,andreasn/cockpit,mareklibra/cockpit,cockpituous/cockpit,martinpitt/cockpit,vanloswang/cockpit,deryni/cockpit,larsu/cockpit,martinpitt/cockpit,larskarlitski/cockpit,deryni/cockpit,larsu/cockpit,arilivigni/cockpit,stefwalter/cockpit,mvollmer/cockpit,cockpituous/cockpit,harishanand95/cockpit,larskarlitski/cockpit,michalskrivanek/cockpit,mareklibra/cockpit,Scribery/cockpit,michalskrivanek/cockpit,sgallagher/cockpit,michalskrivanek/cockpit,SotolitoLabs/cockpit,michalskrivanek/cockpit,dperpeet/cockpit,garrett/cockpit,Scribery/cockpit,petervo/cockpit,sgallagher/cockpit,Scribery/cockpit,sgallagher/cockpit,deryni/cockpit,cockpituous/cockpit,dperpeet/cockpit,mareklibra/cockpit,deryni/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,vanloswang/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,stefwalter/cockpit,Scribery/cockpit,moraleslazaro/cockpit,xhad/cockpit,moraleslazaro/cockpit,arilivigni/cockpit,martinpitt/cockpit,larskarlitski/cockpit,cockpituous/cockpit,arilivigni/cockpit,mvollmer/cockpit,dperpeet/cockpit,garrett/cockpit,dperpeet/cockpit,vanloswang/cockpit,andreasn/cockpit,cockpit-project/cockpit,larsu/cockpit,harishanand95/cockpit,stefwalter/cockpit,andreasn/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpituous/cockpit,larskarlitski/cockpit,harishanand95/cockpit,SotolitoLabs/cockpit,xhad/cockpit,michalskrivanek/cockpit,harishanand95/cockpit,stefwalter/cockpit,stefwalter/cockpit