Bug 572162 - Migrate update files to new update directory after updates. r=rstrong
Bug 572162 - Update root dir migration xpcshell tests. r=rstrong
Bug 572162 - Cleanup new update directory and obsolete old after updates and installs. r=rstrong
Bug 572162 - Use TaskbarIDs hash as update dir root. r=rstrong
Bug 572162 - Changes to tests for update root hash changes. r=rstrong