To prepare for implementing ControllerRef across all controllers,
this pushes the common adopt/orphan logic into ControllerRefManager
so each controller doesn't have to duplicate it.
This also shares the adopt/orphan logic between Pods and ReplicaSets,
so it lives in only one place.
Automatic merge from submit-queue
controller: adopt pods only when controller is not deleted
When a replica set is deleted it will continue adopting pods thus driving the worker that handles it in erroring out because the adoption is [always cancelled](59c313730c/pkg/controller/controller_ref_manager.go (L110)) in the controller reference manager.
```
E1212 14:40:31.245773 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-73c3m_791e16cb-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.258462 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-73c3m_791e16cb-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.259131 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-73c3m_791e16cb-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.259149 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-wrmt8_791e3d46-c070-11e6-a234-68f72840e7df because the controlller is being deleted
I1212 14:40:31.268012 7964 deployment_controller.go:314] Error syncing deployment e2e-tests-deployment-2rr3m/test-rollover-deployment: Operation cannot be fulfilled on deployments.extensions "test-rollover-deployment": the object has been modified; please apply your changes to the latest version and try again
E1212 14:40:31.277252 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-73c3m_791e16cb-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.277276 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-wrmt8_791e3d46-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.277287 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-bmqpn_81482114-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.289148 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-b6s4x_82fa8343-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.289169 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-73c3m_791e16cb-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.289176 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-wrmt8_791e3d46-c070-11e6-a234-68f72840e7df because the controlller is being deleted
E1212 14:40:31.289181 7964 replica_set.go:616] cancel the adopt attempt for pod e2e-tests-deployment-2rr3m_test-rollover-deployment-1981456318-bmqpn_81482114-c070-11e6-a234-68f72840e7df because the controlller is being deleted
```
@kubernetes/deployment @caesarxuchao