occasional failures from test_list_tags_dotted_revnos_unsupported

[Jelmer Vernooij]

FAIL: breezy.tests.blackbox.test_tags.TestTagging.test_list_tags_dotted_revnos_unsupported
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Traceback (most recent call last):
testtools.testresult.real._StringException: log: {{{
904.551 creating repository in file:///tmp/testbzr-nDFwmA.tmp/breezy.tests.blackbox.test_tags.TestTagging.test_list_tags_dotted_revnos_unsupported/work/branch/.bzr/.
904.564 creating branch <breezy.bzr.branch.BzrBranchFormat7 object at 0xfff0000109ac9090> in file:///tmp/testbzr-nDFwmA.tmp/breezy.tests.blackbox.test_tags.TestTagging.test_list_tags_dotted_revnos_unsupported/work/branch/
904.601 trying to create missing lock u'/tmp/testbzr-nDFwmA.tmp/breezy.tests.blackbox.test_tags.TestTagging.test_list_tags_dotted_revnos_unsupported/work/branch/.bzr/checkout/dirstate'
904.604 opening working tree u'/tmp/testbzr-nDFwmA.tmp/breezy.tests.blackbox.test_tags.TestTagging.test_list_tags_dotted_revnos_unsupported/work/branch'
904.646 preparing to commit
    INFO Committing to: /tmp/testbzr-nDFwmA.tmp/breezy.tests.blackbox.test_tags.TestTagging.test_list_tags_dotted_revnos_unsupported/work/branch/
904.656 Selecting files for commit with filter None
    INFO Committed revision 1.
904.707 Committed revid <email address hidden> as revno 1.
904.726 run brz: ['tags', '-d', 'branch']
904.726 breezy version: 3.0a2
904.726 brz arguments: [u'tags', u'-d', u'branch']
904.752 output:
b'mytag 1\n'
}}}

Traceback (most recent call last):
  File "/<<PKGBUILDDIR>>/breezy/tests/blackbox/test_tags.py", line 285, in test_list_tags_dotted_revnos_unsupported
    self.assertEqual(out, 'mytag ?\n')
  File "/<<PKGBUILDDIR>>/breezy/tests/__init__.py", line 1317, in assertEqual
    pprint.pformat(a), pprint.pformat(b)))
AssertionError: not equal:
a = 'mytag 1\n'
b = 'mytag ?\n'

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