SshProcessInterface: Limit waiting for kill to finish

This is just a workaround for 9.0 and not a proper fix!

It looks like sometimes kill command may freeze. Don't blocking
wait for it for 30 seconds - limit this time to 2 seconds.

Do the same inside SimpleTargetRunner. Pretend the process
finished after 2 seconds, otherwise the SimpleTargetRunner
object gets leaked and we start receiving asserts from
ProcessLauncher about destructing it when still some processes
are being run.

Task-number: QTCREATORBUG-28072
Change-Id: I9766e7ff6f0c2abf2010686027702d30d32c4318
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/runcontrol.cpp

@@ -1320,7 +1320,11 @@ void SimpleTargetRunnerPrivate::stop()
         switch (m_state) {
             case Run:
                 m_process.stop();
-                m_process.waitForFinished();
+                if (!m_process.waitForFinished(2000)) { // TODO: it may freeze on some devices
+                    QTC_CHECK(false); // Shouldn't happen, just emergency handling
+                    m_process.close();
+                    forwardDone();
+                }
                 break;
             case Inactive:
                 break;