Pin debian-jessie deb mirror to ftp.us.debian.org
Pin debian-jessie deb mirror to ftp.us.debian.org

We are seeing random failures with http://httpredir.debian.org/debian
so the hope is pinning to ftp.us.debian.org will result is more
consistent deb mirrors.

Change-Id: Ib3ee31fcdfa7ba3df827e730bdfab9b7fc4c284d
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

openstack-infra/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config,Tesora/tesora-project-config,dongwenjuan/project-config