[packaging] Add missing dependency to pygobject2
[tests] Fix TestKeyFile: sort list before comparing
[tests] Fix TestAccountSet::testFilters

The ordering of mAM->allAccounts() has changed. Fixed so it works
irrespective of the order.
[tests] Fix TestDBusProxyFactory::testDropRefs

(Hopefully) prevent getting the new proxy instantiated on the very same
address.
[telepathy-qt] Fix HandledChannelNotifier after porting to Qt5

The QObject::connectNotify() signature changed in Qt5.

Detected by
TestAccountChannelDispatcher::testCreateAndHandleChannelHandledAgain()
which hags forever because HandledChannelNotifier::handledAgain() is
never emitted.