[Merge] lp:~mterry/ubuntu-release-upgrader/u-m-symlinks into lp:ubuntu-release-upgrader

[Michael Terry]

Michael Terry has proposed merging lp:~mterry/ubuntu-release-upgrader/u-m-symlinks into lp:ubuntu-release-upgrader.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1020462 in ubuntu-release-upgrader (Ubuntu): "Precise to Quantal upgrade failed: do-release-upgrade -d failed with ImportError: No module named janitor.plugincore.manager in DistUpgradeQuirks.py"
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1020462

For more details, see:
https://code.launchpad.net/~mterry/ubuntu-release-upgrader/u-m-symlinks/+merge/113260

This branch adds back some symlinks necessary to make the dist upgrade tarball more self sufficient.

What's the best test reproduction steps to help make sure this fixes all issues?
-- 
https://code.launchpad.net/~mterry/ubuntu-release-upgrader/u-m-symlinks/+merge/113260
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~mterry/ubuntu-release-upgrader/u-m-symlinks into lp:ubuntu-release-upgrader.
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