By Arshad Mohammed and Parisa Hafezi (Reuters) – One of the last obstacles to reviving the 2015 Iran nuclear deal – Tehran’s demand to remove its Revolutionary Guards from a U.S. terrorism list – is more an issue of politics than substance, analysts said. While the two sides had appeared close to reviving the pact a month ago, talks have since stalled over last-minute Russian demands, the Nowruz holiday, and the unresolved issue of whether Washington might remove the Islamic Revolutionary Guard Corps (IRGC) from the U.S. Foreign Terrorist Organization (FTO) list. The United States and Iran hav…