Comment 2 for bug 1537916

Tested this and /tmp/ubuntu-release-upgrader-$TEMP/ has DistUpgrade.cfg.trusty which contains the following:

[Sources]
From=trusty
To=wily
ValidOrigin=Ubuntu
ValidMirrors = mirrors.cfg
Components=main,restricted,universe,multiverse
Pockets=security,updates,proposed,backports
;AllowThirdParty=False

So its verified.