The adoption test should not depend on the iscsi deploy

It was removed many releases ago, the test is now always skipped.

Change-Id: I0f03575ed99afbfe49c8207403d4d0ae5d1d50da
diff --git a/ironic_tempest_plugin/tests/scenario/ironic_standalone/test_adoption.py b/ironic_tempest_plugin/tests/scenario/ironic_standalone/test_adoption.py
index ba56917..d6a5a50 100644
--- a/ironic_tempest_plugin/tests/scenario/ironic_standalone/test_adoption.py
+++ b/ironic_tempest_plugin/tests/scenario/ironic_standalone/test_adoption.py
@@ -34,7 +34,7 @@
         driver = 'ipmi'
     image_ref = CONF.baremetal.whole_disk_image_ref
     wholedisk_image = True
-    deploy_interface = 'iscsi'
+    deploy_interface = 'direct'
     # 1.37 is required to be able to copy traits
     api_microversion = '1.37'