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core, data: Fix Samsung user agent for downgrade

- There was a typo: HHP vs HPP
- [TV] is part of the changeable name
- Apparently there are two versions: SEC HHP and SEC_HHP

So this patch just unifies the two Samsung User-Agents and forces
downgrades for every Samsung device.
media-export: Work-around bgo#680366

Conflicts:
	src/plugins/media-export/rygel-media-export-harvesting-task.vala
Prepare 0.14.3
server: Always set complete seek range

So the pipeline generates EOS when it reaches the end; that prevents
that for 0-n requests the pipeline is running all the time, spamming
useless idle callbacks.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=671361

Conflicts:
	src/rygel/rygel-http-response.vala