By Rodrigo Campos and Marc Jones NEW YORK/LONDON (Reuters) – Developing world investors, buffeted by various “taper tantrums” over the last decade, are now nervously watching as the rainmaker of global markets – the U.S. Federal Reserve – readies its most aggressive rate hike cycle in 17 years. More hot jobs data on Friday drove the benchmark for world borrowing costs, the 10-year U.S. Treasury yield, to its highest level in two years, prompting yet more gnashing of teeth among emerging market money managers already having a tough year. Deutsche Bank’s analysts point out that while some curren…