By Anthony Deutsch AMSTERDAM (Reuters) -Amsterdam’s Schiphol airport urged travellers to stay away for several hours on Saturday as a strike by ground personnel at the start of a school holiday caused chaos at Europe’s third-busiest airport. “The terminal is too full at the moment … Schiphol is calling on travellers not to come to the airport anymore,” airport authorities said in a statement issued shortly before noon (1000 GMT). Almost three hours later the airport said passengers were welcome again but would still face long waiting times and possible delays or cancellations. Police closed …