BERLIN Germans are in kebab angst. They worry that their most beloved street food option, the spicy, juicy kebab in a pita that can be found on every street corner across Germany , may get more expensive — or even worse, that the country may be sliding into a national kebab shortage. Workers at one of Germany's biggest kebab factories are locked in a bitter and ongoing fight with their employer over wages and working conditions. For weeks, workers at the Birtat Meat World SE factory in