Jonathan Rosser b04481c82c Re-order gate cleanup pip package removal
The packages are now removed in reverse dependency order. The previous
order would remove packages until a dependancy conflict would arise,
then would stop and the pip task would return 'changed' rather than
'failed'. See [1].

In addition, the pip installation of tox is removed.

[1] http://paste.openstack.org/show/789996/

Change-Id: I4f701ca5e7caa4d5ef182ca3eba523702bdae36a
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