[Merge] lp:~vorlon/ubuntu-release-upgrader/lp.1220898 into lp:ubuntu-release-upgrader

[Brian Murray]

I think there is still more that could be removed, so far I've found:

_test_and_warn_on_old_nvidia()
_checkAndInstallBroadcom()
_test_and_warn_on_nvidia_and_no_sse()
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https://code.launchpad.net/~vorlon/ubuntu-release-upgrader/lp.1220898/+merge/184174
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