Fix: org.gnome.SessionManager RuntimeError (Issue 276) #278
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Fixes the error with Gnome SessionManager based keepawake (#276)
DBus Adapters
All DBusAdapters now have to keep reference to the connection(s). This was required as if the connection instance was garbage collected, the inhibit cookie created by Gnome SessionManager was wiped.
The DBusAdapter class now has _get_connection(bus) method or getting a connection instance for an adapter.
The DBusAdapter subclasses now must implement a _create_new_connection(bus) method.
Other
Temporarily ignore warnings in tests/integration/conftest.py while running gc.collect(). This should be addressed later (likely as part of #277)