(Reuters) -Boeing's new Starliner capsule and an inaugural two-member NASA crew safely docked with the International Space Station on Thursday, meeting a key test in proving the vessel's flight-worthiness and sharpening Boeing's competition with Elon Musk's SpaceX. The rendezvous was achieved despite an earlier loss of several guidance-control jet thrusters, some of them due to a helium propulsion leak, which NASA and Boeing said should not compromise the mission.