Fetch conference data only once

Fetching the conference data each time we authenticate may create too
much traffic as it causes other objects to be fetched too.
Thus fetch the conference only once after a successful authentication.
If no conference were fetched though, allow another conference query.

Also, enable authentication only on devices. It may not always be necessary
but this allows the application to resume properly after a potential
undeterminated state (device went to sleep for example)

Change-Id: I14f1b298be95dfb16a62daa480d6b0a995eced7f
Reviewed-by: Niels Weber <niels.weber@digia.com>

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