[Merge] ~chad.smith/ubuntu-release-upgrader:esm-support-pro-upgrades into ubuntu-release-upgrader:ubuntu/master

[Chad Smith]

Chad Smith has proposed merging ~chad.smith/ubuntu-release-upgrader:esm-support-pro-upgrades into ubuntu-release-upgrader:ubuntu/master.

Requested reviews:
  Brian Murray (brian-murray)
Related bugs:
  Bug #1897778 in ubuntu-release-upgrader (Ubuntu): "DistUpgradeController to release apt lock during PostInstallScripts"
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1897778

For more details, see:
https://code.launchpad.net/~chad.smith/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/391725

Followup fixes for ubuntu advantage upgrade support

1. Instead of a private stable PPA  for ubuntu-advantage we needed to create a public PPA that didn't require authentication. update the PPA URL in mirrors.cfg to http://ppa.launchpad.net/ua-client/stable/ubuntu

2.  DistUpgradeController.py also needs to release the lock /var/lib/apt/lists/lock in runPostInstallScripts using  self.cache.unlock_lists_dir()

3. added a new dch entry (and corrected the duplicate bug referenced in previous changelog entry
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