ssh: Always set the ssh knownhosts option
ssh: Always set the ssh knownhosts option

Otherwise the users home dir might get used and change the
algo during ssh_connect. This was causing the ssh tests to
fail in some setups.

Closes #6716
moraleslazaro/cockpit,larsu/cockpit,mvollmer/cockpit,garrett/cockpit,moraleslazaro/cockpit,garrett/cockpit,xhad/cockpit,larsu/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,larskarlitski/cockpit,andreasn/cockpit,harishanand95/cockpit,harishanand95/cockpit,cockpituous/cockpit,harishanand95/cockpit,larsu/cockpit,andreasn/cockpit,deryni/cockpit,petervo/cockpit,cockpit-project/cockpit,larskarlitski/cockpit,dperpeet/cockpit,larsu/cockpit,michalskrivanek/cockpit,dperpeet/cockpit,xhad/cockpit,cockpit-project/cockpit,larskarlitski/cockpit,mareklibra/cockpit,larsu/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,andreasn/cockpit,martinpitt/cockpit,Scribery/cockpit,dperpeet/cockpit,mvollmer/cockpit,petervo/cockpit,harishanand95/cockpit,Scribery/cockpit,dperpeet/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,andreasn/cockpit,xhad/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,larsu/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,Scribery/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,michalskrivanek/cockpit,larskarlitski/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,andreasn/cockpit,cockpituous/cockpit,stefwalter/cockpit,petervo/cockpit,larskarlitski/cockpit,dperpeet/cockpit,mvollmer/cockpit,larskarlitski/cockpit,harishanand95/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,deryni/cockpit,cockpituous/cockpit,deryni/cockpit,petervo/cockpit,michalskrivanek/cockpit,cockpit-project/cockpit,mvollmer/cockpit,xhad/cockpit,mareklibra/cockpit,garrett/cockpit,xhad/cockpit,cockpit-project/cockpit,petervo/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,cockpituous/cockpit,Scribery/cockpit,cockpituous/cockpit,deryni/cockpit,Scribery/cockpit,mareklibra/cockpit,cockpit-project/cockpit,xhad/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,dperpeet/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,stefwalter/cockpit,xhad/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,Scribery/cockpit,garrett/cockpit,harishanand95/cockpit,mareklibra/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,deryni/cockpit,petervo/cockpit,mvollmer/cockpit,petervo/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,larskarlitski/cockpit,dperpeet/cockpit