tst_QDBusAbstractAdaptor::initTestCase() flaky

 agent:2019/08/07 07:22:04 build.go:240: ********* Start testing of tst_QDBusAbstractAdaptor *********
  Config: Using QtTest library 5.14.0, Qt 5.14.0 (arm-little_endian-ilp32-eabi-hardfloat shared (dynamic) release build; by GCC 7.3.0)
  dbus[32749]: Could not get password database information for UID of current process: User "???" unknown or no memory to allocate password entry
  
  dbus[32749]: Could not get password database information for UID of current process: User "???" unknown or no memory to allocate password entry
  
  [     0.001 W] default unknown - QDBusAbstractAdaptor: Cannot relay signal MyServer::newConnection(QDBusConnection): Unregistered input type in parameter list: QDBusConnection
  FAIL!  : tst_QDBusAbstractAdaptor::initTestCase() 'rpl2.type() == QDBusMessage::ReplyMessage' returned FALSE. (Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.)