switch to deb.d.o from httpredir.d.o (#8288).

The deb.debian.org method may be a better one than httpredir:

. deb.debian.org is maintained much more reliably than httpredir

. httpredir is backed by the mirror network; deb.d.o is by a CDN

. httpredir redirects to the mirror network. deb.d.o is a cache
  that sits in front of ftp.d.o (and security, and debug, and ports)

. one potential disadvantage: deb.d.o's CDN is a commercial
  service (fastly) that donates its traffic to debian

. in stretch and later, apt uses the SRV records of deb.d.o to find
  places instead of HTTP redirects

. local peering arrangements of fastly are likely to result in mirror
  choices that are more local (and thus faster) to the machine

Peering arrangements for the deb.d.o CDN can be seen here:
https://www.peeringdb.com/asn/54113

Change-Id: I4dee089a3b2f674860bfff21eb25a6e37c491d32

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