web: Make DBusClient useable also when it's not ready.
web: Make DBusClient useable also when it's not ready.

By adding DBusClient.prototype.get and emitting change notification
signals during the initial seeding.

Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

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