By Joanna Plucinska and Christina Amann BERLIN, June 10 (Reuters) - Germany's ILA air show opened on Wednesday under the twin shadows of the Iran war and the collapse this week of a flagship Franco-German fighter jet project, clouding what is meant to be one of Europe's premier aerospace showcases. The Berlin event, which dates back to 1909, puts a large slice of Europe's defence industry on display as companies pitch new technology to governments and military buyers.