Update User Guide and Admin links to point to new resources. (#3438)

* Update links to outdated user-guide and admin docs

* Add script for updating outdated links.

* Update regex to include init-containers file.

* Pull upstream, rewrite links in and to namespaces walkthrough.

docs/concepts/workloads/pods/pod-lifecycle.md

@@ -158,18 +158,18 @@ duration (determined by the master) will expire and be automatically destroyed.
 
 Three types of controllers are available:
 
-- Use a [Job](/docs/user-guide/jobs/) for Pods that are expected to terminate,
+- Use a [Job](/docs/concepts/jobs/run-to-completion-finite-workloads/) for Pods that are expected to terminate,
   for example, batch computations. Jobs are appropriate only for Pods with
   `restartPolicy` equal to OnFailure or Never.
 
-- Use a [ReplicationController](/docs/user-guide/replication-controller/),
-  [ReplicaSet](/docs/user-guide/replicasets/), or
-  [Deployment](/docs/user-guide/deployments/)
+- Use a [ReplicationController](/docs/concepts/workloads/controllers/replicationcontroller/),
+  [ReplicaSet](/docs/concepts/workloads/controllers/replicaset/), or
+  [Deployment](/docs/concepts/workloads/controllers/deployment/)
   for Pods that are not expected to terminate, for example, web servers.
   ReplicationControllers are appropriate only for Pods with a `restartPolicy` of
   Always.
 
-- Use a [DaemonSet](/docs/admin/daemons/) for Pods that need to run one per
+- Use a [DaemonSet](/docs/concepts/workloads/controllers/daemonset/) for Pods that need to run one per
   machine, because they provide a machine-specific system service.
 
 All three types of controllers contain a PodTemplate. It