[PyQt] Issue: PyQt5 can only connect to one D-Bus service, not two.

[David Roberts]

Hello. I'm pretty sure this is a bug, but I'm having trouble connecting to
two D-Bus services at once. The second connection connects to the first
service, although it claims to be correctly connected to the second service.

I have detailed my findings on StackOverflow in the form of a question. <
https://stackoverflow.com/questions/52657066/pyqt5-how-to-connect-to-two-d-bus-services-at-once>.
I will, however, attach the minimal reproduction case here as well.

In a nutshell, both result1 and result2 are the same after running the
following code:

    provider1API = QDBusInterface('com.krontech.chronos.control.mock', '/',
'',
        QDBusConnection.systemBus() )
    provider2API = QDBusInterface('com.krontech.chronos.video.mock', '/',
'',
        QDBusConnection.systemBus() )

    result1 = QDBusReply(provider1API.call('exampleCall')).value()
    result2 = QDBusReply(provider2API.call('exampleCall')).value()

result1 and result2 should be different, since they are connecting to two
different D-Bus interfaces which return two different results.

I am using Python 3.7, PyQt 5.11.2, and Qt 5.11.1 on Debian 7.

Thank you,
–DDR

(Note: To enable D-Bus, you may need a D-Bus policy file. I have attached
an example one, com.krontech.chronos.conf, but if you're not running Python
as root you will need to change the username in it. The policy file goes in
/etc/dbus-1/system.d/.)
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