Only try kerberos auth when username contains `@` and pass realm to pywinrm.…

Only try kerberos auth when username contains `@` and pass realm to pywinrm. Alternative to #10644, fixes #10577.

lib/ansible/runner/connection_plugins/winrm.py

@@ -80,13 +80,18 @@ class Connection(object):
         netloc = '%s:%d' % (self.host, port)
         exc = None
         for transport, scheme in self.transport_schemes['http' if port == 5985 else 'https']:
-            if transport == 'kerberos' and not HAVE_KERBEROS:
+            if transport == 'kerberos' and (not HAVE_KERBEROS or not '@' in self.user):
                 continue
+            if transport == 'kerberos':
+                realm = self.user.split('@', 1)[1].strip() or None
+            else:
+                realm = None
             endpoint = urlparse.urlunsplit((scheme, netloc, '/wsman', '', ''))
             vvvv('WINRM CONNECT: transport=%s endpoint=%s' % (transport, endpoint),
                  host=self.host)
             protocol = Protocol(endpoint, transport=transport,
-                                username=self.user, password=self.password)
+                                username=self.user, password=self.password,
+                                realm=realm)
             try:
                 protocol.send_message('')
                 return protocol