By Alan Baldwin LONDON (Reuters) – New Aston Martin team boss Mike Krack has had a bumpy start to the season, like those Formula One drivers struggling to tame their bouncing cars in a time of change, but he is still smiling. The 50-year-old Luxemburger replaced Otmar Szafnauer, now principal of Renault-owned Alpine, at the Silverstone-based team last January in something of a surprise appointment. “I was not expecting it to be easy,” he told Reuters in Monaco at the weekend. “It’s a rough environment, you must not be naive. “But I’m fine, I’m still laughing so it’s OK.” Four times world champ…