test_migrations: Avoid returning a filter object for python3
Otherwise it confuses oslo.db.
Closes-Bug: #1522731
Change-Id: I1a246eea9adef10ec6c025e9b620f87ee9318dd7
(cherry picked from commit b989e9d181
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@ -131,7 +131,7 @@ class _TestModelsMigrations(test_migrations.ModelsMigrationsSync):
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object_, name, type_, reflected, compare_to)
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def filter_metadata_diff(self, diff):
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return filter(self.remove_unrelated_errors, diff)
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return list(filter(self.remove_unrelated_errors, diff))
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# Remove some difference that are not mistakes just specific of
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# dialects, etc
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