By Riham Alkousaa BERLIN (Reuters) – Germany’s conservatives look set to come first in a regional election in the northern state of Schleswig-Holstein on Sunday in a boost to former Chancellor Angela Merkel’s party, which was ousted from national government in federal elections last year. The Christian Democrats (CDU) have a big lead in polls in the state, whose nearly 3 million residents account for roughly 3.5% of Germany’s population. One survey published by ZDF Politbarometer on Thursday put support for the CDU at 38% in Schleswig-Holstein, widening the gap with the Social Democrats (SPD) …