test: Fix tight race condition in Machines external provider test
test: Fix tight race condition in Machines external provider test

`check-machines TestMachines.testExternalConsole` would fail with a
timeout waiting for `#dynamically-generated-file` when running with
debugging/verbosity enabled, as the 500 ms window for catching the
temporary <a> was too short -- an Anti-Heisenbug.

Bump the timeout to 5s.

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