By Stephen Nellis and Sinéad Carew (Reuters) - Cisco Systems Inc on Wednesday forecast that within four years, about half its revenue will come from software and other recurring sales, but its chief financial officer told Reuters high chip prices in its hardware business will keep pressuring overall profits. Cisco is the biggest maker of networking gear for data centers and corporate campuses, but it is shifting toward selling recurring subscriptions for software such as its WebEx collaboration service and cybersecurity services. At an event with Wall Street analysts, Cisco said it believes the portion of its revenue coming from...