[test_service] correct upstart service name and permissions

The 'service' utility was unable to find the 'ansible_test' service due to an
unexpected filename.  This patch corrects the filename and adjusts the
permissions to match other service scripts within /etc/init/.

test/integration/roles/test_service/tasks/upstart_cleanup.yml

 - name: remove the upstart init file
-  file: path=/etc/init/ansible_test state=absent
+  file: path=/etc/init/ansible_test.conf state=absent
   register: remove_upstart_result
 
 - name: assert that the upstart init file was removed
   assert:
     that:
-    - "remove_upstart_result.path == '/etc/init/ansible_test'"
+    - "remove_upstart_result.path == '/etc/init/ansible_test.conf'"
     - "remove_upstart_result.state == 'absent'"
 

test/integration/roles/test_service/tasks/upstart_setup.yml

 - name: install the upstart init file
-  copy: src=ansible.upstart dest=/etc/init/ansible_test mode=0755
+  copy: src=ansible.upstart dest=/etc/init/ansible_test.conf mode=0644
   register: install_upstart_result
 
 - name: assert that the upstart init file was installed
   assert:
     that:
-    - "install_upstart_result.dest == '/etc/init/ansible_test'"
+    - "install_upstart_result.dest == '/etc/init/ansible_test.conf'"
     - "install_upstart_result.state == 'file'"
-    - "install_upstart_result.mode == '0755'"
+    - "install_upstart_result.mode == '0644'"
     - "install_upstart_result.md5sum == 'ab3900ea4de8423add764c12aeb90c01'"