Updated openstack/openstack
Project: openstack/nova  1d51543b23c11ca9a605f276169c9420a84f9263

Use datetime object for fake network timestamps

The fake networks use a pre-serialized timestamp in str(datetime)
format which which doesn't give us the opportunity to test the
serialization code properly and isn't the format use in practice.

Use real dateime objects instead.

Full context here:

  http://lists.openstack.org/pipermail/openstack-dev/2014-April/033971.html

Change-Id: I5cbe722fb59cdd326b4c75dcfea14f206d71f668