[PUSHED-3-5][PUSHED-3-5-5] rhbz#678440: Always include User-Agent to avoid 403 from picky servers

[Caolán McNamara]

On Tue, 2012-06-12 at 23:59 +0200, Michael Stahl wrote:
> On 12.06.2012 22:42, Fridrich Strba wrote:
> > Cherry-picked to 3-5, we need two more people for the 3-5-5 branch.
> 
> +1 from me

pushed to 3-5-5

C.