Update notes for submitted changes

* TT#69603 jessie-backports no longer exists, adjust apt sources.list

f7ea42018086a0a6f005e827f4b9485814e6e60d

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+Verified+1: Jenkins Jenkins
+Code-Review+2: Alexander Lutay <alutay@sipwise.com>
+Submitted-by: Michael Prokop <mprokop@sipwise.com>
+Submitted-at: Mon, 04 Nov 2019 11:02:29 +0100
+Reviewed-on: http://gerrit.mgm.sipwise.com/c/ec2-tools/+/34864
+Project: ec2-tools
+Branch: refs/heads/master