Citi analyst Jim Suva upgraded Arista Networks Inc., noting that the recent sell-off has provided a good buying opportunity for investors. Suva raised his rating to Buy from Neutral and reiterated the $150 price target, suggesting an upside of 26.44 percent. Suva noted that the 17 percent decline year-to-date occurred, although Arista’s fundamentals are “strong,” as capital expenditure spending…