Fix svn_fs unit-tests for alternate db backends (forgot a `reset_db`...).
Fix svn_fs unit-tests for alternate db backends (forgot a `reset_db`...).

All tests pass for all db backends.


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@9818 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac