Tweaked merge_hash to also affect Runner behavior

test/test_hash_behavior/goodbye.yml

@@ -0,0 +1,3 @@
+---
+messages:
+  goodbye: "Goodbye World!"

test/test_hash_behavior/hello.yml

@@ -0,0 +1,3 @@
+---
+messages:
+  hello: "Hello World!"

test/test_hash_behavior/message.j2

@@ -0,0 +1,3 @@
+{% for k, v in messages.iteritems() %}
+{{ k }}: {{ v }}
+{% endfor %}

test/test_hash_behavior/playbook.yml

@@ -0,0 +1,11 @@
+---
+- hosts: all
+  connection: local
+
+  vars_files:
+    - hello.yml
+    - goodbye.yml
+
+  tasks:
+    - name: generate messages
+      action: template src=message.j2 dest=/tmp/ansible_test_messages.out