check-kubernetes: Fix race in React code while setting elements value
check-kubernetes: Fix race in React code while setting elements value

The onChange() event is either not called or fully processed before
subsequent hitting "Create" button.

Closes #9347
garrett/cockpit,martinpitt/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,deryni/cockpit,garrett/cockpit,martinpitt/cockpit,andreasn/cockpit,cockpit-project/cockpit,deryni/cockpit,garrett/cockpit,martinpitt/cockpit,mareklibra/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,deryni/cockpit,andreasn/cockpit,cockpituous/cockpit,mareklibra/cockpit,mareklibra/cockpit,stefwalter/cockpit,stefwalter/cockpit,moraleslazaro/cockpit,andreasn/cockpit,mareklibra/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,garrett/cockpit,stefwalter/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,andreasn/cockpit,moraleslazaro/cockpit,garrett/cockpit,cockpit-project/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,deryni/cockpit,deryni/cockpit,andreasn/cockpit,cockpituous/cockpit,mvollmer/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,deryni/cockpit,andreasn/cockpit,stefwalter/cockpit,SotolitoLabs/cockpit,cockpituous/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit,stefwalter/cockpit,deryni/cockpit,mvollmer/cockpit,andreasn/cockpit