Move Guide topic: Bootstrapping Pet Sets. (#2662)

* Move Guide topic: Bootstrapping Pet Sets.

* Add TOC entry.

_data/concepts.yml

@@ -20,6 +20,7 @@ toc:
   - title: Controllers
     section:
     - docs/concepts/abstractions/controllers/statefulsets.md
+    - docs/concepts/abstractions/controllers/petsets.md
     - docs/concepts/abstractions/controllers/garbage-collection.md
 
 - title: Object Metadata

docs/concepts/abstractions/controllers/petsets.md

@@ -0,0 +1,15 @@
+---
+assignees:
+- bprashanth
+- enisoc
+- erictune
+- foxish
+- janetkuo
+- kow3ns
+- smarterclayton
+title: PetSets
+---
+
+__Warning:__ Starting in Kubernetes version 1.5, PetSet has been renamed to [StatefulSet](/docs/concepts/abstractions/controllers/statefulsets). To use (or continue to use) PetSet in Kubernetes 1.5, you _must_ [migrate](/docs/tasks/manage-stateful-set/upgrade-pet-set-to-stateful-set/) your existing PetSets to StatefulSets. For information on working with StatefulSet, see the tutorial on [how to run replicated stateful applications](/docs/tutorials/stateful-application/run-replicated-stateful-application).
+
+__This document has been deprecated__.

docs/user-guide/petset/bootstrapping/index.md

@@ -10,7 +10,9 @@ assignees:
 title: Bootstrapping Pet Sets
 ---
 
-__Warning:__ Starting in Kubernetes version 1.5, PetSet has been renamed to [StatefulSet](/docs/concepts/abstractions/controllers/statefulsets). To use (or continue to use) PetSet in Kubernetes 1.5, you _must_ [migrate](/docs/tasks/manage-stateful-set/upgrade-pet-set-to-stateful-set/) your existing PetSets to StatefulSets. For information on working with StatefulSet, see the tutorial on [how to run replicated stateful applications](/docs/tutorials/stateful-application/run-replicated-stateful-application).
+{% include user-guide-content-moved.md %}
+
+[PetSets](/docs/concepts/abstractions/controllers/petsets/)
+
 
-__This document has been deprecated__.