Change file loading mechanism for heat tests

Improve file loading mechanism for heat tests. Previously,
heat tests loaded template files for every tests. "types.set"
allows to exclude redundant file operations from tests.
In addition, the unit tests for heat rally-scenarios were updated
and mocking of CONF.benchmark was excluded from unit-tests.

Change-Id: Ibdace7bf96ff822701ee8505f1dcd232999a6fe8

rally-jobs/extra/default.yaml.template

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

rally-jobs/rally.yaml

@@ -571,6 +571,8 @@
 
   HeatStacks.create_and_list_stack:
     -
+      args:
+        template_path: "/home/jenkins/.rally/extra/default.yaml.template"
       runner:
         type: "constant"
         times: 6
@@ -585,6 +587,8 @@
 
   HeatStacks.create_and_delete_stack:
     -
+      args:
+        template_path: "/home/jenkins/.rally/extra/default.yaml.template"
       runner:
         type: "constant"
         times: 6

samples/tasks/scenarios/heat/create-and-delete-stack.json

@@ -1,6 +1,9 @@
 {
     "HeatStacks.create_and_delete_stack": [
         {
+            "args": {
+               "template_path": "templates/default.yaml.template"
+            },
             "runner": {
                 "type": "constant",
                 "times": 10,

samples/tasks/scenarios/heat/create-and-delete-stack.yaml

@@ -1,6 +1,8 @@
 ---
   HeatStacks.create_and_delete_stack:
     -
+      args:
+        template_path: "templates/default.yaml.template"
       runner:
         type: "constant"
         times: 10

samples/tasks/scenarios/heat/create-and-list-stack.json

@@ -1,6 +1,9 @@
 {
     "HeatStacks.create_and_list_stack": [
         {
+            "args": {
+               "template_path": "templates/default.yaml.template"
+            },
             "runner": {
                 "type": "constant",
                 "times": 10,

samples/tasks/scenarios/heat/create-and-list-stack.yaml

@@ -1,6 +1,8 @@
 ---
   HeatStacks.create_and_list_stack:
     -
+      args:
+        template_path: "templates/default.yaml.template"
       runner:
         type: "constant"
         times: 10

samples/tasks/scenarios/heat/templates/default.yaml.template

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