Exit 0 with no matched hosts

And also print to stdout not err

This lines up with how ansible-playbook will exit. 0 in the case of no
matched hosts. This makes it easier to script ansible commands w/
variable iventory input which may or may not have an entry for the
specific ansible task being scripted. No matched hosts is acceptable,
but matched hosts w/ failures is not.

bin/ansible

@@ -81,8 +81,8 @@ class Cli(object):
             inventory_manager.subset(options.subset)
         hosts = inventory_manager.list_hosts(pattern)
         if len(hosts) == 0:
-            callbacks.display("No hosts matched", stderr=True)
+            callbacks.display("No hosts matched")
-            sys.exit(1)
+            sys.exit(0)
 
         if options.listhosts:
             for host in hosts: