[Merge] lp:~mterry/update-manager/continue-on-error into lp:update-manager

[Michael Terry]

Michael Terry has proposed merging lp:~mterry/update-manager/continue-on-error into lp:update-manager.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1049046 in update-manager (Ubuntu): "Software updater stops complete update if only one source cannot be found"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1049046

For more details, see:
https://code.launchpad.net/~mterry/update-manager/continue-on-error/+merge/139789

When an update error occurs, currently Software Updater just stops completely with the error.  This branch implements the part of the spec [1] that covers errors during update.  Specifically:

* Show a dialog with the error, and Settings, Try Again, and OK buttons.
* If OK is pressed with updates, show a sub-header that notes there were some errors.
* If OK is pressed with no updates, show a slightly different message than normal (one less confident that system is up to date).

Tests added too for most of the code paths.

[1] Spec not quite updated yet, but see mpt's comments: https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1049046/comments/5
-- 
https://code.launchpad.net/~mterry/update-manager/continue-on-error/+merge/139789
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~mterry/update-manager/continue-on-error into lp:update-manager.
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