trac.db.tests.api test failures with mysql

[Christian Boos]

The table names are normalized to lower case, when queried in MySQL (on Windows only apparently). This means that the following test will fail, slightly differently according to the branch:

On 1.0-stable:

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FAIL: test_table_names (trac.db.tests.api.ConnectionTestCase)
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Traceback (most recent call last):
  File "C:\projects\trac\trac\db\tests\api.py", line 502, in test_table_names
    self.assertIn(table.name, db_tables)
AssertionError: 'HOURS' not found in [u'attachment', u'auth_cookie', u'blog', u'cache', u'component', u'enum', u'hours', u'milestone', u'node_change', u'permission', u'report', u'repository', u'revision', u'session', u'session_attribute', u'system', u'ticket', u'ticket_change', u'ticket_custom', u'version', u'wiki']

On trunk:

======================================================================
FAIL: test_get_table_names (trac.db.tests.api.ConnectionTestCase)
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Traceback (most recent call last):
  File "C:\projects\trac\trac\db\tests\api.py", line 492, in test_get_table_names
    sorted(db.get_table_names()))
AssertionError: Lists differ: ['HOURS', 'attachment', 'auth_... != [u'attachment', u'auth_cookie'...

First differing element 0:
HOURS
attachment

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