terminal: Remove componentWillMount method
terminal: Remove componentWillMount method

This method is being obsoleted, see https://reactjs.org/docs/react-component.html#unsafe_componentwillmount

garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,garrett/cockpit,deryni/cockpit,cockpituous/cockpit,mvollmer/cockpit,martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,deryni/cockpit,mvollmer/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,deryni/cockpit,martinpitt/cockpit,deryni/cockpit,deryni/cockpit,mvollmer/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,garrett/cockpit,cockpituous/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,deryni/cockpit,cockpituous/cockpit