[Merge] lp:~javier.collado/ubuntu-test-cases/bug1087630 into lp:~ubuntu-server-dev/ubuntu-test-cases/server-tests-raring

[Javier Collado]

Review: Resubmit

Max, I've updated the merge to address your concerns:

- the unneeded return code check in the late command has been removed

- the parsing now looks for the first line that starts with "Root partition
  usage:" to avoid problems due to unexpected ordering of lines in
  /var/log/utah-install

-- 
https://code.launchpad.net/~javier.collado/ubuntu-test-cases/bug1087630/+merge/142161
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