[Merge] lp:~manzurmm/update-manager/update-manager into lp:update-manager

[Manzur]

Manzur has proposed merging lp:~manzurmm/update-manager/update-manager into lp:update-manager.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~manzurmm/update-manager/update-manager/+merge/309095

This change adds error message when `do-release-upgrade` is not able to reach METARELEASE_URI. Currently, it just prints 'No new release found' message, which can be confusing.
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~manzurmm/update-manager/update-manager into lp:update-manager.
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