BRUSSELS (Reuters) -Spain's acting deputy prime minister met exiled Catalan politician Carles Puigdemont in Brussels on Monday, seeking support from the separatist fugitive from Spanish justice to keep Pedro Sanchez's left-leaning coalition in power. Yolanda Diaz met the Catalan separatist following an inconclusive election on July 23 which resulted in a hung parliament, making Puigdemont, who has been living in self-imposed exile in Belgium since leading Catalonia's failed push for secession fr