Updated openstack/openstack
Project: openstack/nova  58e6eb857a5e1b5ce99cf3e8b0e1f51e9c884516

Change ViewBuilder into v2.1 for servers

This patch changes v3 servers' ViewBuilder to v2.1. And also
change related unittests and api sample tests.

The differences between v2 and v3 are described on the wiki page
https://wiki.openstack.org/wiki/NovaAPIv2tov3.

Partially implements blueprint v2-on-v3-api

Change-Id: Ie68d46daa91ef43c84eeef479c0986d5e7f15719