- Add support for annotations in oc_service
- Use oc_service instead of oc_obj
- Use oc_pvc instead of oc_obj
- Work around lack of idempotency for oc_obj DeploymentConfig

Add support for `labels` and `externalIPs` in Services
This also adds support for the `labels` parameter of `oadm registry`
and `oadm router` to be a `dict` of values.
This also converts `labels` dict values in the router and registry
classes into a comma delimited list of `key=value` pairs.
The list of `--labels` is sorted for consistency in key pair positioning
in the output (and for consistency in testing) - otherwise, the order
of the list is not guarantee and has actually been observed to be
different from run to run.