Photo: David Paul Morris/Bloomberg, ShU studio/ShutterstockLandmark cybersecurity deal would mark Palo Alto’s boldest move yet and reshape the identity security market.The cybersecurity market is heating up: According to a Wall Street Journal report published Tuesday, Palo Alto Networks is in advanced negotiations to acquire Israeli company CyberArk for more than $20 billion.Palo Alto, the world’s largest cybersecurity company with a market capitalization of $130 billion, is eyeing CyberArk, a r...