Merge ~powersj/cloud-init:fix-debian-backports into cloud-init:master

[Joshua Powers]

template: Update debian backports template

Debian backports are contains in the main repo and not somewhere
seperate. Thanks to Charles Plessy.

LP: #1627293

[Server Team CI bot (server-team-bot)]

PASSED: Continuous integration, rev:5c9bc07158ea9bec9b09f9a8275c2d39c95ffcec
https://jenkins.ubuntu.com/server/job/cloud-init-ci/227/
Executed test runs:
    SUCCESS: https://jenkins.ubuntu.com/server/job/cloud-init-ci/nodes=metal-amd64/227
    SUCCESS: https://jenkins.ubuntu.com/server/job/cloud-init-ci/nodes=metal-arm64/227
    SUCCESS: https://jenkins.ubuntu.com/server/job/cloud-init-ci/nodes=metal-ppc64el/227
    SUCCESS: https://jenkins.ubuntu.com/server/job/cloud-init-ci/nodes=metal-s390x/227
    SUCCESS: https://jenkins.ubuntu.com/server/job/cloud-init-ci/nodes=vm-i386/227

Click here to trigger a rebuild:
https://jenkins.ubuntu.com/server/job/cloud-init-ci/227/rebuild

review: Approve (continuous-integration)

[Scott Moser (smoser)]

review: Approve

diff --git a/templates/sources.list.debian.tmpl b/templates/sources.list.debian.tmpl
index c8043f7..d64ace4 100644
--- a/templates/sources.list.debian.tmpl
+++ b/templates/sources.list.debian.tmpl
@@ -26,7 +26,5 @@ deb-src {{mirror}} {{codename}}-updates main contrib non-free
 ## N.B. software from this repository may not have been tested as
 ## extensively as that contained in the main release, although it includes
 ## newer versions of some applications which may provide useful features.
-{#
-deb http://backports.debian.org/debian-backports {{codename}}-backports main contrib non-free
-deb-src http://backports.debian.org/debian-backports {{codename}}-backports main contrib non-free
--#}
+deb {{mirror}} {{codename}}-backports main contrib non-free
+deb-src {{mirror}} {{codename}}-backports main contrib non-free