output_thread: removed the old event loop DNS event type
output_thread: removed the old event loop DNS event type

output_thread: removed the old event loop DNS event type
handling code in favor of the custom event implementation

output_thread: removed the lookup_context cleanup list in favor of
a thread wide dns context that holds both the active and drop
lists

Signed-off-by: Leonardo Alminana <7610bae85f2b530654cc716772f1fe653373e892@calyptia.com>

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