Fix detection of Fedora distros for latest F8 style trees

Author: berrange

virtinst/DistroManager.py

@@ -210,6 +210,9 @@ def acquireBootDisk(self, fetcher, progresscb):
 # Fedora distro check
 class FedoraImageStore(RedHatImageStore):
     def isValidStore(self, fetcher, progresscb):
+        if fetcher.hasFile("fedora.css", progresscb):
+            logging.debug("Detected a Fedora distro")
+            return True
         if fetcher.hasFile("Fedora", progresscb):
             logging.debug("Detected a Fedora distro")
             return True