Use minimal image and flavor for base scenario test

This test case can use cirros, and does not require additional
features.

Change-Id: I2eb569fc2b4a9ff01b979cd631ec58d2ac6e72ad
diff --git a/heat_tempest_plugin/tests/scenario/test_base_resources.py b/heat_tempest_plugin/tests/scenario/test_base_resources.py
index ddd8564..44de5b1 100644
--- a/heat_tempest_plugin/tests/scenario/test_base_resources.py
+++ b/heat_tempest_plugin/tests/scenario/test_base_resources.py
@@ -21,10 +21,10 @@
 
     def setUp(self):
         super(BasicResourcesTest, self).setUp()
-        if not self.conf.image_ref:
-            raise self.skipException("No image configured to test")
-        if not self.conf.instance_type:
-            raise self.skipException("No flavor configured to test")
+        if not self.conf.minimal_image_ref:
+            raise self.skipException("No minimal image configured to test")
+        if not self.conf.minimal_instance_type:
+            raise self.skipException("No minimal flavor configured to test")
 
     def check_stack(self):
         sid = self.stack_identifier
@@ -55,8 +55,8 @@
         self.private_net_name = test.rand_name('heat-net')
         parameters = {
             'key_name': test.rand_name('heat-key'),
-            'flavor': self.conf.instance_type,
-            'image': self.conf.image_ref,
+            'flavor': self.conf.minimal_instance_type,
+            'image': self.conf.minimal_image_ref,
             'vol_size': self.conf.volume_size,
             'private_net_name': self.private_net_name
         }