The open source software for running cloud computing installations just got a big new name in its camp: IBM.Big Blue announced today that all of its cloud services and software will be based on an open cloud architecture. It’s good news for potential IBM customers because it means they can mix-and-match service and equipment vendors — Dell, Hewlett-Packard and Rackspace are also big OpenStack fans — without worried about getting stuck with one.Its first move will be to spin up a private cloud service based on OpenStack. There’s also some new software, specifically something called IBM SmartCloud Monitoring Application Insight, that’s aimed at