Don't re-query inventory when trimming failed/dark hosts

Since the filter list contains hosts, passing that back to list_hosts()
in the inventoy causes issues when the hostname is an IPv6 address
(with :'s interpreted as group unions). Since we already have the list
of hosts, we should not need to pass that back through inventory a
second time.

Fixes #7446

lib/ansible/playbook/__init__.py

@@ -348,7 +348,7 @@ class PlayBook(object):
     def _trim_unavailable_hosts(self, hostlist=[]):
         ''' returns a list of hosts that haven't failed and aren't dark '''
 
-        return [ h for h in self.inventory.list_hosts(hostlist) if (h not in self.stats.failures) and (h not in self.stats.dark)]
+        return [ h for h in hostlist if (h not in self.stats.failures) and (h not in self.stats.dark)]
 
     # *****************************************************