Table metadata written out during an initial load that does not respect sym_router.target_table_name

When initial.load.delete.first=true, the table metadata written out to CSV didn't use the target settings in sym_router. Because the initial load did use the target settings, a different table name was written and because the trigger history id was the same, the column metadata was not written.

See http://sourceforge.net/projects/symmetricds/forums/forum/739236/topic/4607504

The solution is to pass the router id to the purge event.