base: Flip the default for ListenSocket::accept(bool nodelay).

This option was almost always overridden from false to true anyway,
except in one place (in the ethertap device) which was likely just by
accident.

This will give external users a chance to remove the option without
changing behavior, so that the option can be removed entirely in a
later change.

Change-Id: I77add40b8131b91997b2aecbfff6c7de0ee9ead9
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/69157
Reviewed-by: Yu-hsin Wang <yuhsingw@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/base/socket.hh

@@ -104,7 +104,7 @@ class ListenSocket
     ListenSocket();
     virtual ~ListenSocket();
 
-    virtual int accept(bool nodelay = false);
+    virtual int accept(bool nodelay = true);
 
     virtual bool listen(int port, bool reuse = true);