A STUDY TO ASSESS THE EFFICACY OF FLUTICASONE FUROATE/VILANTEROL (FF/VI) INHALATION POWDER 100/25 MCG ONCE DAILY COMPARED WITH FLUTICASONE PROPIONATE/SALMETEROL INHALATION POWDER 250/50 MCG TWICE DAILY IN SUBJECTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE (COPD):