test: Update expected Openshift error message
test: Update expected Openshift error message

In "check-openshift TestOpenshift.testConnect", the new Openshift
version now responds with "cannot watch all persistentvolumes in the
cluster", instead of "list", so update the expected string.

Closes #6398
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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