Fix 19575: Docker events doesn't work with authorization plugin

To support the requirement of blocking the request after the daemon
responded the authorization plugin use a `response recorder` that replay
the response after the flow ends.

This commit adds support for commands that hijack the connection and
flushes data via the http.Flusher interface. This resolves the error
with the event endpoint.

Signed-off-by: Liron Levin <liron@twistlock.com>

authorization/authz.go

@@ -116,7 +116,7 @@ func (ctx *Ctx) AuthZResponse(rm ResponseModifier, r *http.Request) error {
 		}
 	}
 
-	rm.Flush()
+	rm.FlushAll()
 
 	return nil
 }