BUG/MEDIUM: cli/debug: Properly get the stream-int in all debug I/O handlers

The appctx owner is not a stream-interface anymore. It is now a conn-stream.
In the cli I/O handler for the command "debug dev fd", we still handle it as
a stream-interface. It is now fixed.

It is 2.6-specific, no backport is needed.
1 file changed