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Title: Draining inboundonly and graceful do not work together

Description:

when draining listeners with inboundonly&graceful&skip_exit, the inboundonly attribute is ignored.

You can see here it is never used at all:

Repro steps:
curl httpbin.org/get -v and look for connection: close header. Note this goes through an outbound listener.

• Before: no close.
• curl -X POST localhost:15000/'drain_listeners?inboundonly: no close header set
• curl -X POST localhost:15000/'drain_listeners?inboundonly&graceful&skip_exit: close header is set unexpectedly