Core support for ip-per-service
Add and update docs.
Add e2e test
Rackspace support
Add local-up support
Add vagrant support
Merge pull request #1402 from thockin/services_v2

Services v2 (ip-per-service)
Extract list must flatten nodes across directories
Enforce unique constraint at namespace boundary in etcd, make client and server namespace aware
Merge pull request #1564 from derekwaynecarr/enforce_namespace_unique_constraints

Enforce namespace unique constraints
systemd example unit and environment files