By Michele KambasNICOSIA, March 6 (Reuters) - A drone strike this week on a British air base in Cyprus has renewed calls for an end to British military presence on the Mediterranean island as many fear being dragged into the wider Iran conflict.Cypriot politicians have long been uneasy with Britain's two air bases, Akrotiri and Dhekelia, which have existed as sovereign British territory since Cyprus gained independence from the United Kingdom in 1960.