Service name for Azure mirrors

[Bastian Blank <waldi@debian.org>]

Hi mirror team

Please allocate a service name under debian.org for the Debian mirror
network within Microsoft Azure.  For now it should point to
debian-archive.trafficmanager.net.

I outlined the reasoning why it is necessary in
[🔎] 20160110143126.GB16059@shell.thinkmo.de.

Regards,
Bastian

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