add DB constraints to all M2M pivot tables to enforce unique rows and enforce foreign key relationships.  cleanup the DB beforehand to ensure these constraints will be applicable.  this is by far the most complex migration to date, but it appears to work just fine.

Signed-off-by: Steve Howard <showard@google.com>


git-svn-id: http://test.kernel.org/svn/autotest/trunk@3224 592f7852-d20e-0410-864c-8624ca9c26a4
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