When using the view plugin, filtered and unfiltered server blocks can
share the same zone and port. The zone overlap validation rejected this
configuration when the unfiltered block was not declared last, because
filtered configs treated an already-registered zone as an error.
Skip the 'already defined' check for configs that have filter functions,
since they are expected to coexist with an unfiltered catch-all block on
the same zone/port.
Fixes#7733
Signed-off-by: umut-polat <52835619+umut-polat@users.noreply.github.com>
2263340fab