Cannot run tests on OS X due to platform specific features

[Mathieu Gagné]

The commit c1afe8001c90a17463a62f0c5c454767a7d88d86 added tests to improve test coverage: https://review.openstack.org/43448

Those tests are platform dependent as they require loop device support which is not available on Mac OS X.

We should skip those tests on OS X.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/114309

[Huang Zhiteng (zhiteng-huang)]

I have also seen these on OS X. It seems 'ENAVAIL' errno code doesn't exist for OS X. We should do skip these tests as well.

======================================================================
FAIL: cinder.tests.test_prophetstor_dpl.TestProphetStorDPLDriver.test_delete_snapshot
----------------------------------------------------------------------
Traceback (most recent call last):
_StringException: Empty attachments:
  stderr
  stdout

Traceback (most recent call last):
  File "/opt/stack/cinder/cinder/tests/test_prophetstor_dpl.py", line 488, in test_delete_snapshot
    self.dpldriver.delete_snapshot(DATA_IN_SNAPSHOT)
  File "/opt/stack/cinder/cinder/volume/drivers/prophetstor/dplcommon.py", line 956, in delete_snapshot
    elif ret == errno.ENAVAIL:
AttributeError: 'module' object has no attribute 'ENAVAIL'

======================================================================
FAIL: cinder.tests.test_prophetstor_dpl.TestProphetStorDPLDriver.test_delete_volume
----------------------------------------------------------------------
Traceback (most recent call last):
_StringException: Empty attachments:
  stderr
  stdout

Traceback (most recent call last):
  File "/opt/stack/cinder/cinder/tests/test_prophetstor_dpl.py", line 438, in test_delete_volume
    self.dpldriver.delete_volume(DATA_IN_VOLUME)
  File "/opt/stack/cinder/cinder/volume/drivers/prophetstor/dplcommon.py", line 852, in delete_volume
    elif ret == errno.ENAVAIL:
AttributeError: 'module' object has no attribute 'ENAVAIL'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/115333

[OpenStack Infra (hudson-openstack)]

Change abandoned by Mathieu Gagné (<email address hidden>) on branch: master
Review: https://review.openstack.org/114309
Reason: Abandon in favour of:
- https://review.openstack.org/#/c/115333/
- https://review.openstack.org/#/c/114709/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/115333
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=f5217aa63c8e39e27d8fc782caad0c24a7265805
Submitter: Jenkins
Branch: master

commit f5217aa63c8e39e27d8fc782caad0c24a7265805
Author: Rick Chen <email address hidden>
Date: Wed Aug 20 00:12:23 2014 +0800

    Modify error code compatible with Mac OS.

    Mac OS builtin python errno object has no
    attribute 'ENAVAIL'.
    Changed
      errno.ENAVAIL --> errno.ENODATA
    Another when backend storage service not ready, the
    error code "ENAVAIL" change to "ENOPROTOOPT".

    Change-Id: I0c41dfe44a4dea02329ff21df881f4c133fe6099
    Closes-Bug: 1357010