contrail: Fix keystoneclient minimum depends

Vnc api server us keystoneclient.middleware (auth_token), this
feature was introduced in keystoneclient in >= 0.2.2, but we have
2012.1-0ubuntu1 (essex version, pre 0.1.0) in precise.

We need to backport kestoneclient >= 0.2.2, to the PPA
Merge pull request #112 from sbadia/fix-keystoneclient

contrail: Fix keystoneclient minimum depends