Fix rally internal Heat job

Previous scenarious were obsolete.
This patch adds necessary paramater "template_path".
Also default.yaml template was added for using in this list of scenarios.

Additionally fix wrong import in sample_plugin.py

Change-Id: I31cd295d322d907883a22cddef25b5ccc609f2c1

rally-scenarios/extra/default.yaml

@@ -0,0 +1 @@
+heat_template_version: 2014-10-16

rally-scenarios/heat-fakevirt.yaml

@@ -1,6 +1,8 @@
 ---
   HeatStacks.create_and_list_stack:
     -
+      args:
+        template_path: "~/.rally/extra/default.yaml"
       runner:
         type: "constant"
         times: 2000
@@ -12,6 +14,8 @@
 
   HeatStacks.create_and_delete_stack:
     -
+      args:
+        template_path: "~/.rally/extra/default.yaml"
       runner:
         type: "constant"
         times: 200

rally-scenarios/plugins/sample_plugin.py

@@ -24,12 +24,12 @@ Rally concepts https://wiki.openstack.org/wiki/Rally/Concepts
 """
 
 
-from rally.benchmark.scenarios import base
+from rally.plugins.openstack import scenario
 
 
-class HeatPlugin(base.Scenario):
+class HeatPlugin(scenario.OpenStackScenario):
 
-    @base.scenario(context={"cleanup": ["heat"]})
+    @scenario.configure(context={"cleanup": ["heat"]})
     def list_benchmark(self, container_format,
                             image_location, disk_format, **kwargs):
         """Get heatclient and do whatever."""