ios: kill simulator process when stopping runner

Change-Id: I998eb9cd3d532c2818c139688d516003d4833b27
Reviewed-by: David Schulz <david.schulz@digia.com>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>

src/plugins/ios/iosrunner.h

@@ -89,6 +89,7 @@ private:
     ProjectExplorer::IDevice::ConstPtr m_device;
     bool m_debuggingMode;
     bool m_cleanExit;
+    Q_PID m_pid;
 };
 
 } // namespace Internal