message: integration tests: Improve message when ZNC is missing
  Previously, "more or less unrelated" things would fail. After this
  change, also a message is printing that gives a hint on what went wrong.
diff: @@ -141,6 +141,8 @@ class Process : public IO<QProcess> {
  m_proc.setProcessEnvironment(env);
  setup(&m_proc);
  m_proc.start(cmd, args);
  + EXPECT_TRUE(m_proc.waitForStarted())
  + << "Failed to start ZNC, did you install it?";
  }
  ~Process() override {
  if (m_kill) m_proc.terminate();
  