test_engine_service should access Template class directly

[Unmesh Gurjar]

Branch: master

Following tests in test_engine_service access template module through service module:
1. test_validate_new_stack_checks_stack_limit
2. test_validate_new_stack_checks_resource_limit

The tests should be modified to access the Template class in template module directly.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/124769

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/124769
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=dad298697b72200bff94d6507d79ebc5607bb67e
Submitter: Jenkins
Branch: master

commit dad298697b72200bff94d6507d79ebc5607bb67e
Author: Unmesh Gurjar <email address hidden>
Date: Mon Sep 29 20:41:56 2014 +0530

    Access Template class through template module

    Fix tests in test_engine_service to refer Template class
    directly (through template module).

    Change-Id: Icc3a7dbd47b230fce6e646cadd5ba2a2a66c6259
    Closes-bug: #1375309