importer: Improve performance of network export query
This patch moves the subqueries out of the large query, so that the
database will materialize them for faster lookup.
We also drop the "UNION ALL" and replace it with just "UNION" because we
do not want any duplicate networks. That will save us many iterations
later on.
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
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