Takashi Kajinami 9bdab05c54 Fix broken unit tests because of list in notification drivers
Because the value for oslo_messaging_notifications/driver is now
a list[1], we should expect that a list is set when multiple drivers
are given.

[1] c7b0cc82fac79b47c3dd9a625cbd5a1eb192ed00

Change-Id: I2fbf613bdb32194e8862bc1eaaa0a7c76af01048
2020-04-15 00:00:50 +09:00
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