Sesnd SIGINT to end port-forward

tools/ktest/namespace.py

@@ -96,14 +96,16 @@ def forward(self, svc: str, ports: Mapping[int, int]):
             yield proc
         finally:
             logger.debug("terminating port-forward: %s", svc)
-            for stop in (proc.terminate, proc.kill):
+
+            def ctrl_c():
+                proc.send_signal(signal.SIGINT)
+
+            for stop in (ctrl_c, proc.terminate, proc.kill):
                 logger.debug("attempting to '%s' port-forward: %s", stop.__name__, svc)
                 stop()
                 try:
-                    proc.communicate(timeout=3)
+                    proc.communicate(timeout=15)
                     logger.debug("port-forward exited: %s", svc)
-                    # wait for the port to become available again
-                    time.sleep(3)
                     break
                 except subprocess.TimeoutExpired:
                     logger.info("timeout expired waiting for: %s", svc)