[Merge] lp:~mterry/update-manager/stop-update into lp:update-manager

[Michael Terry]

Michael Terry has proposed merging lp:~mterry/update-manager/stop-update into lp:update-manager.

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

For more details, see:
https://code.launchpad.net/~mterry/update-manager/stop-update/+merge/120318

mpt added some dialogs recently to the update-manager experience if the user stops an apt update.  See https://wiki.ubuntu.com/SoftwareUpdates#Launching

This branch implements those changes (and does a little minor cleanup in UpdatesAvailable by dropping some support for num_updates == 0 which shouldn't ever happen now, after the redesign).
-- 
https://code.launchpad.net/~mterry/update-manager/stop-update/+merge/120318
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~mterry/update-manager/stop-update into lp:update-manager.
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