Port Python sources to Python 3 syntax

src/apps/admin/bongo-admin.py

@@ -58,7 +58,7 @@ if __name__ == '__main__':
         try:
             options.authpass = getpass.getpass(_("Enter password for %s: ") % options.authuser)
         except KeyboardInterrupt:
-            print
+            print()
             sys.exit(1)
 
     log.debug("running command: %s", str(command))
@@ -75,14 +75,14 @@ if __name__ == '__main__':
     try:
         ret = command.run(options, args)
     except KeyboardInterrupt:
-        print
+        print()
         sys.exit(1)
     except SystemExit:
         raise
-    except Exception, e:
+    except Exception as e:
         log.debug("Error at bongo-admintool main()", exc_info=1)
         ret = 1
-        print _("ERROR: %s") % str(e)
+        print(_("ERROR: %s") % str(e))
 
     if ret is None:
         sys.exit(0)