Do lookups for user, project

This required https://review.openstack.org/26323 in keystoneclient

Change-Id: I55bededbc20b5dcf2833c59eb2b6b069703d8a9a
Add server migrate command

Blueprint: nova-client

Note: I've tested that the API calls are made correctly but do not have an
environment with migration proerly enabled to watch it complete...

Change-Id: Ideaf0985d43aa2be22390cf0d2850124c549632d
Merge branch 'volume-keystone' into dt-test