By Abdi Sheikh MOGADISHU (Reuters) -Somali politicians voted on Sunday for a new president despite explosions near the fortified airport hangar housing an overdue election required to keep foreign funds flowing to a nation tortured and impoverished by conflict. Thirty-six initial aspirants were reduced to four veteran faces in first-round voting by parliament, guarded by African Union peacekeepers, who are in Somalia to fend off Islamist insurgents. A new leader was expected to be known by Sunday night. The four remaining candidates were Puntland region President Said Abdulahi Deni, incumbent …