tempest/api/orchestration/base.py: load_template() used a restrict path

[Qiu Hua Qiao]

    def load_template(cls, name, ext='yaml'):
        loc = ["tempest", "api", "orchestration",
               "stacks", "templates", "%s.%s" % (name, ext)]
        fullpath = os.path.join(*loc)

        with open(fullpath, "r") as f:
            content = f.read()
            return content

The method restrict the template file in folder 'tempest/api/orchestration/stacks/templates/'
But if we run tempests in other path(like /root/), the case will failed with this error:
[Errno 2] No such file or directory: 'tempest/api/orchestration/stacks/templates/nova_keypair.json'

Stacktrace

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/nose/suite.py", line 208, in run
    self.setUp()
  File "/usr/lib/python2.6/site-packages/nose/suite.py", line 291, in setUp
    self.setupContext(ancestor)
  File "/usr/lib/python2.6/site-packages/nose/suite.py", line 314, in setupContext
    try_run(context, names)
  File "/usr/lib/python2.6/site-packages/nose/util.py", line 469, in try_run
    return func()
  File "/tmp/tempest/tempest/tempest/api/orchestration/stacks/test_nova_keypair_resources.py", line 32, in setUpClass
    template = cls.load_template('nova_keypair', ext=cls._tpl_type)
  File "/tmp/tempest/tempest/tempest/api/orchestration/base.py", line 110, in load_template
    with open(fullpath, "r") as f:
IOError: [Errno 2] No such file or directory: 'tempest/api/orchestration/stacks/templates/nova_keypair.json'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/84363

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/84363
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=f636877b556ae3159a33d135a4c5674bfec0970a
Submitter: Jenkins
Branch: master

commit f636877b556ae3159a33d135a4c5674bfec0970a
Author: Qiu Hua Qiao <email address hidden>
Date: Tue Apr 1 01:12:39 2014 -0500

    Change to use absolute path in load_template()

    If we execute the tempest in other path other than the root path of
    tempest, the case will failed because can't find the template files.

    Change-Id: Ic585546270b2c6d7a42d3128d752217d8d4e3860
    Closes-bug: 1300597