image_uploader: switch stdout_callback to tripleo_dense

... because this is cool and consistent with the rest of Ansible
configurations.

Change-Id: I819d057cf4673a50231be6277160b986c232e692
(cherry picked from commit c19ee50441)

tripleo_common/image/image_uploader.py

@@ -536,7 +536,7 @@ class BaseImageUploader(object):
                 extra_env_variables=dict(os.environ),
                 override_ansible_cfg=(
                     "[defaults]\n"
-                    "stdout_callback=yaml\n"
+                    "stdout_callback=tripleo_dense\n"
                     "log_path=%s\n" % log_f
                 )
             ).run(None)

tripleo_common/tests/image/test_image_uploader.py

@@ -1235,7 +1235,7 @@ class TestSkopeoImageUploader(base.TestCase):
             extra_env_variables=mock.ANY,
             override_ansible_cfg=(
                 "[defaults]\n"
-                "stdout_callback=yaml\n"
+                "stdout_callback=tripleo_dense\n"
                 "log_path=%s/tripleo-container-image-prepare-ansible.log\n"
                 % os.path.dirname(logfile.name)
             )