Updated openstack/openstack
Project: openstack/nova  035af98f2048cd1f66d9dab1daa409fea51b8aad
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Update ubuntu dev env instructions

I just set up an environment to run unit tests on Ubuntu and had to install a
couple of additional packages to make it work.  Update the instructions to
reflect that.

Change-Id: I2ceb1b130111991fa1b34b4636b8ece115e54084