Apply inventory host restrictions by host name rather than UUID.

Issue #15633 observes that a meta: inventory_refresh task causes the playbook
to exit. An inventory refresh flushes all caches and rebuilds all host
objects, assigning new UUIDs to each. These new host UUIDs currently fail to
match those on host objects stored for restrictions in the inventory, causing
the playbook to exit for having no hosts to run further tasks against.

This changeset attempts to address this issue by storing host restrictions
by name, and comparing inventory host names against these names when applying
restrictions in get_hosts.

lib/ansible/inventory/__init__.py

@@ -204,7 +204,7 @@ class Inventory(object):
 
                 # exclude hosts mentioned in any restriction (ex: failed hosts)
                 if self._restriction is not None:
-                    hosts = [ h for h in hosts if h in self._restriction ]
+                    hosts = [ h for h in hosts if h.name in self._restriction ]
 
             seen = set()
             HOSTS_PATTERNS_CACHE[pattern_hash] = [x for x in hosts if x not in seen and not seen.add(x)]
@@ -600,7 +600,7 @@ class Inventory(object):
             return
         elif not isinstance(restriction, list):
             restriction = [ restriction ]
-        self._restriction = restriction
+        self._restriction = [ h.name for h in restriction ]
 
     def subset(self, subset_pattern):
         """