We’re exactly 10 days out from the date Vikings’ rookies, quarterbacks and select others report to training camp in Mankato, followed by the first full practice on July 27. Players are squeezing in final precious days of work and play — or both in the case of Stefon Diggs, who is in London promoting the team’s game there October 29 against the Browns and the league’s presence in the U.K. But there is also time for some playful competitive banter and those at the social media keyboards of the Vikings and Redskins are taking advantage.