Djibouti has carried out the first crew change of merchant sailors in its territory and is ready to get home more seafarers who have been stranded by the coronavirus, a senior port official said.Lying on the Bab al-Mandab strait, which is one of the world's busiest shipping chokepoints, Djibouti is a critical transit hub. More than 2,500 ships transit and call at its ports annually.Continued complications with changing over ship crews due to coronavirus restrictions in some jurisdictions is still affecting supply chains despite an easing of lockdown in many parts of the world.Some 400…