Test failures caused by different DB ordering

[Natalia Bidart]

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FAIL: test_screenshots (webcatalog.tests.test_models.ApplicationTestCase)
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Traceback (most recent call last):
  File "/home/nessita/canonical/webcatalog/popular/src/webcatalog/tests/test_models.py", line 142, in test_screenshots
    urls)
AssertionError: Lists differ: ['http://example.com/screensho... != [u'http://example.com/screensh...

First differing element 0:
http://example.com/screenshot1.png
http://example.com/screenshot2.png

- ['http://example.com/screenshot1.png', 'http://example.com/screenshot2.png']
+ [u'http://example.com/screenshot2.png', u'http://example.com/screenshot1.png']

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FAIL: test_video_iframes_urls (webcatalog.tests.test_models.ApplicationTestCase)
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Traceback (most recent call last):
  File "/home/nessita/canonical/webcatalog/popular/src/webcatalog/tests/test_models.py", line 178, in test_video_iframes_urls
    urls)
AssertionError: Lists differ: ['http://example.com/video1.m4... != [u'http://example.com/video2.m...

First differing element 0:
http://example.com/video1.m4v
http://example.com/video2.m4v

- ['http://example.com/video1.m4v', 'http://example.com/video2.m4v']
+ [u'http://example.com/video2.m4v', u'http://example.com/video1.m4v']

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FAIL: test_save_media_urls (webcatalog.tests.test_forms.ForPurchaseApplicationFormTestCase)
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Traceback (most recent call last):
  File "/home/nessita/canonical/webcatalog/popular/src/webcatalog/tests/test_forms.py", line 213, in test_save_media_urls
    ], actual_urls)
AssertionError: Lists differ: ['http://example.com/screensho... != [u'http://example.com/video1.m...

First differing element 0:
http://example.com/screenshot1.png
http://example.com/video1.mp4

- ['http://example.com/screenshot1.png',
? ^^^ ---- - ^^

+ [u'http://example.com/video1.mp4',
? + ^^^ + ^

- 'http://example.com/screenshot2.png',
+ u'http://example.com/screenshot2.png',
? +

- 'http://example.com/video1.mp4']
? ^^^ - ^

+ u'http://example.com/screenshot1.png']
? + ^^^ ++++ + ^^

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Ran 255 tests in 22.665s

FAILED (failures=3)