native-stack: Mark tcp::in_state() (and its wrappers) const noexcept
native-stack: Mark tcp::in_state() (and its wrappers) const noexcept

The method in question jsut resds back the _state field. The wrappers
are just trivial wrappers.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

scylladb/seastar,scylladb/seastar,syuu1228/seastar,scylladb/seastar,syuu1228/seastar,syuu1228/seastar